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[[quoteright:343:[[Film/TheFoodOfTheGods http://static.tvtropes.org/pmwiki/pub/images/big_rat_246.JPG]]]]

->'''Buttercup''': What about the [=R.O.U.S.'s=]?\\
'''Westley''': Rodents of Unusual Size? I don't think they exist.\\
'''R.O.U.S.''': RAGH! ''[attacks Westley]''
-->-- ''Film/ThePrincessBride''

Are they so named because they are unusually ''small'', you ask? Heh, heh, heh...

[[YouDirtyRat Rats]] are probably the most formidable and tenacious mammals in existence, being blessed with swift feet, durable incisors, impressive cunning and intelligence, [[ZergRush numbers]], and an all-consuming sense of self-preservation. The only thing they lack, it seems, is [[AttackOfThe50FootWhatever physical size and power]][[note]] and longevity (the average rat is very lucky to make three years) but don't expect to see ''that'' brought up often[[/note]]. Then, given that final boon, they would surely transform from shadow-scurrying scavengers to [[AttackOfTheKillerWhatever feared, flesh-rending predators]] that would have leather-clad barbarians knocking their knees together (but at least they're easier to hit than life-sized rats).

Incidentally, if you don't find the regular-sized rats particularly worrisome already, then we hasten to point out that they are also world-class swimmers and can hold their breath more than long enough to reach the other end of the pipe leading to your [[TheCanKickedHim toilet]]. (Thankfully, ''giant'' rats can rarely fit through the plumbing.)

Should you encounter these furry freaks, your best defense is to have a MegaNeko by your side. If in a video game, they're likely to be involved in a RatStomp. Occasionally, they're conscripted to provide HamsterWheelPower for large machines or vehicles.

At its most extreme, this trope can overlap with AttackOfThe50FootWhatever. When rodents are not only unnaturally large but also walk upright (at least some of the time) and have human-like intelligence, you have RatMen.

A SubTrope of AnimalsNotToScale, DireBeast.


* ''Anime/GalaxyAngel'' had this alien hamster thing which they found in the ruins of a once great city.
* ''Anime/YuGiOh'' has a monster outright called "Giant Rat". Then there are Nimble Momonga, which is just a very large flying squirrel, and a bunch of other more pathetic low-level monsters, like Beaver Warrior, which looks more like a rat than a beaver, but is a rodent either way. Some, like the Giant Rat, Nimble Momonga, and Super Nimble Mega Hamster, can be useful in swarm tactics.
* In ''Idle Champions of the Forgotten Realms'', there are large rats attacking the party.
* A ''Anime/{{Pokemon}}'' episode had a giant robot Pikachu. Pikachu himself is also large for a rodent - he stands at 16 inches (41 centimeters).
* The Wise King of the Forest in ''WebNovel/{{Overlord}}'' is very similar to a hamster, with the exception of a long scaled tail that resembles a snake's more than anything. [[SheIsTheKing She]] is also enormous enough for a human to ride her like a horse, and powerful enough to be worshiped as a legendary beast (though no match against [[AlwaysABiggerFish our ridiculous main character]]).

[[folder:Comic Books]]
* Creator/NeilGaiman's gag biography in ''ComicBook/TheSandman: The Season of Mists'' [[SuspiciouslySpecificDenial denies]] that he was found outside a London sewer unable to say anything more than "Powerful big rats, gentlemen". And then goes on to deny that he had a vestigial tail, played a part in the ''obviously fictional'' negotiations between Londons Above and [[Literature/{{Neverwhere}} Below]], or that there were any tooth marks on the bones.
* In the ''ComicBook/JudgeDredd'' universe they have these. After examining the meat from one they decide to farm them in place of the [[ReducedToRatburgers regular rats they used to farm]].
* ''ComicBook/BeastsOfBurden'' has a Rat king leading the sewer rats, and his general is a rat larger than the two cats who fight him.
* There's a WesternAnimation/DonaldDuck comic where Don and his cousin Fethry team up to fight giant rat ghosts. Unusually big rodents shouldn't be a foreign concept to Donald, considering [[MickeyMouse whom]] he used to co-star with early on his animated career...
* The Franchise/SpiderMan villain Vermin is a humanoid rat.
* Prince Raffendorf, from Larry Elmore's ''Snarfquest'' comic strip, was a human prince before being turned into a giant humanoid rat by an evil wizard.
* In ''ComicBook/{{Bone}}'', the Giant Rat Creatures, despite that they are drawn without snouts and that they cut off their rat tails as a cultural ritual.
* One supporting character from ''ComicBook/{{Elementals}}'' was a wererat who had a crush on Fathom.
* ''Franchise/{{Superman}}: Distant Fires'' was an Elseworld story in which the world comes to an end, non-superpowered humans have become feral, and rats and housecats are now the size of panthers.

* Several Kia car commercials feature giant hamsters, sometimes complete with giant hamster wheels.
* In an ad for Doritos, a man puts a piece of an extra-cheesy dorito on a mousetrap, then sits down to eat some more. A giant mouse (well, a man in a mouse suit) bursts out of the wall and tackles him, presumably not being satisfied with the tiny tip of one chip.
* Orkin's series of Giant Creepy Crawly extermination-service ads now includes one in which a family comes home from a trip to find scruffy human-sized rats hanging out in their living room.
* There's a commercial for extra-durable work pants which demonstrates their toughness with a giant cartoon beaver, which loses its teeth trying to bite through a pair.

* In ''Fanfic/TheSteepPathAhead'' Saito and Luise go on a RatStomp to earn money only for the rats to be as large as they are because they had gotten involved in some [[AlchemyIsMagic Alchemy]] experiments.

[[folder:Film - Live Action]]
* [[TropeNamers Named]] after the R.O.U.S. from ''Film/ThePrincessBride''. (When Wesley tells Buttercup that he thinks they [[TemptingFate don't exist]] - see the quote above - he's lying to convince her to calm down. He had seen the monsters clearly a few minutes earlier.)
* The movie adaptation of H. G. Wells' ''Film/TheFoodOfTheGods'' features giant rats besieging some people in a cabin. Or rather, it features normal rats romping around a miniature set, and a few prop rat-heads that make "The Talons of Weng-Chiang" look like ''Aliens'' by comparison.
* The film ''Altered Species'' has a giant lab rat released by protesters who thanks them by trying to eat them all.
* In one of the Eddie Murphy ''Film/TheNuttyProfessor'' movies, the Professor accidentally creates a giant hamster.
* The Cantina Scene in ''Film/ANewHope'' features one, and the Franchise/StarWarsExpandedUniverse comes complete with a wide variety of mostly large rodents, [[http://starwars.wikia.com/wiki/Category:Rodent_sentient_species sentient]] and [[http://starwars.wikia.com/wiki/Category:Rodents non]]. Later in the film, Luke describes "womp rats" as being "not much bigger than two meters."
* The anthology-film ''Film/{{Nightmares}}'' had a segment in which a rat the size of an SUV terrorized a suburban family.
* One appears in the '60s [[BMovie B]] sci-fi/horror flick ''Film/JourneyToTheSeventhPlanet''. It has no hair, and one eye.
* ''Film/OfUnknownOrigin'' is a surprisingly good movie about a New Yorker who's terrorized by one of these. It's not a mutant. It's not an alien or magical. It's just a big, mean, nasty, and EXTREMELY determined ''Rattus norvegicus'', which figures his apartment is its territory.
* ''Rodentz'' features these creatures as its antagonists, and the film is pretty much [[http://www.youtube.com/watch?v=5MbDE7pzwT0 just as bad as the name would imply.]]
* In the remake of ''Willard'', the role of Ben was played by a Gambian pouched rat, making him far bigger than the rest of Willard's colony.
* Let us not forget ''Rats: Night of Terror'' set in a post-apocalyptic future where the rescuing men in the radiation suits take off their gas masks to reveal that...well I think you know that they ain't gonna be human!
* The bizarre movie ''Black Moon'' featured a truly massive, cat-sized rat (probably an African Pouched Rat) that could talk.
* Italian movie ''Quella Villa in Fondo al Parco'' (aka ''The Ratman'') has a genetically engineered rat-human hybrid wreaking havoc.
* The formerly human rat monster in ''Bottom Feeder''.
* ''Mulberry Street'' has a virus break out in Manhattan, one that causes people to mutate into homicidial rat creatures.
* The title dollhouse in ''Film/AmityvilleDollhouse'' transforms a regular mouse into a giant one. It dies when the dollhouse is tipped over.
* ''Film/TheKillerShrews'' features giant shrews. (Well, giant for shrews, at least. They're played by [[{{Slurpasaur}} German-shepherd-sized dogs in cheap prosthetics]].) Technically, of course, shrews aren't rodents at all. Close enough for this trope's purposes, though.
* Although it's normal-sized, the squirrel in the second ''Film/NightAtTheMuseum'' plays this trope straight from inch-tall Octavius's POV.
* Bunch of rats in ''Film/DeadlyEyes'' stow away in a freighter filled with contaminated grain. Once the ship reach its destination, their diet has transformed them into aggressive mankillers the size of small dogs.
* Sandy Cheeks from ''WesternAnimation/TheSpongeBobMovieSpongeOutOfWater'' is a rare ''heroic'' example. Usually she's an anthropomorphic squirrel no bigger than someone's hand, but in her superhero form "The Rodent", she, as well as being very realistic looking, is about twice the size of a human.
* The first segment of ''Film/TrilogyOfTerrorII'', "The Graveyard Rats", has eponymous rats that are big as dogs and have a taste for human flesh.
* The Squogers from the 2007 film adaptation of ''Film/BridgeToTerabithia'' are shaggy black-furred warrior-squirrels the size of large dogs, which Jesse and Leslie imagine as minions of the Dark Master.
* In ''Film/AntMan'', Scott's perilous first experience being shrunken includes a brief run-in with a normal-sized mouse, which pursues him until it runs into a trap.

* In the second part of ''Literature/GulliversTravels'', the titular hero is woken up by two rats on his first night in [[AttackOfTheFiftyFootWhatever Brobdingnag]]. He notes it is a good thing he went to sleep with his sword, otherwise he would have been eaten alive.
* ''Literature/NineteenEightyFour'' by George Orwell features enormous rats, apparently capable of chewing straight through a man's head. The Party uses them as a torture device [[spoiler:on Winston in {{Room 101}}, knowing that [[WhyDidItHaveToBeSnakes Winston is terrified of rats]]]].
* The Creator/StephenKing short story ''Graveyard Shift'' has a lot of rats of usual size...[[spoiler:until you go down to the sub-basement where there are not only rodents of unusual size but they're mutated as well, the "queen" of which is big enough to eat a man]](appears in the collection ''Literature/NightShift'').
* The Creator/JamesHerbert trilogy of novels: ''Literature/TheRats'', ''Lair'' and ''Domain''.
* ''Literature/TheChroniclesOfNarnia''
** Reepicheep (and the other Talking Mice), who is described to be two feet tall. And he knows no fear.
** The squirrels too. For some reason, all the {{Talking Animal}}s in Narnia that would be smallest in our world are slightly larger there, while the biggest ones (like elephants) are slightly smaller. This is {{lampshade|Hanging}}d in ''Literature/TheMagiciansNephew''.
** Given that even Peter could enter their home with ease, Mr. and Mrs. Beaver must've been quite a bit bigger than normal as well.
* The ''Literature/{{Goosebumps}}'' book ''Monster Blood II'' had a 10-foot tall hamster in it.
* In ''The Resistance'', the forty-seventh book in the ''Literature/{{Animorphs}}'' series, the team morphs beavers to create a dam as part of a last-ditch battle strategy against an impending Yeerk invasion force.
** This trope can also be seen in the book right after this one, ''The Return''. [[ExactlyWhatItSaysOnTheTin As the title indicates]], the book deals with the return of SixthRangerTraitor David, who was last seen [[FateWorseThanDeath trapped in rat morph]] by the heroes and left abandoned on [[SealedRoomInTheMiddleOfNowhere a tiny desolate island in the middle of the ocean]]. The rat David's become is described as slightly larger than normal rats and later chapters reveal he's a better fighter too, as Rachel is pitted against him in a rat morph of her own and can't do much more than run away from him.
* The speculative pop-biology book ''Literature/AfterManAZoologyOfTheFuture'' posits a world 50 million years hence where carnivores have gone extinct in much of the world and rodents have evolved to fill the niches left by felines, canines, bears, weasels, wolverines, and so on.
* Literature/SherlockHolmes once makes a passing mention of a case involving the giant rat of Sumatra, "a story for which the world is not yet prepared". Many, many pastiche and fanfic writers have picked up this reference over the years and based [[https://en.wikipedia.org/wiki/Giant_Rat_of_Sumatra#In_Sherlockiana their own stories]] on it. Of all the "untold tales" of Sherlock Holmes, this is probably the one that's been told the most often.
* The last verse of ''Genesis's All in a Mouse's Night'' has a cat getting beaten up with one blow by a giant mouse.
* The rats from ''Literature/TheNutcracker''. Although, technically they were no bigger than the Nutcracker...
* ''Literature/TheUnderlandChronicles'' has these as main characters- not to mention the giant insect and bats....
* The only non-mutant human creatures seen in the future in ''Mindwarp'' are giant rodents the size of a capybara. It is hinted they are descended from rats.
* The children's novels ''The Castle in the Attic'' and ''The Battle for the Castle'', by Elizabeth Winthrop, are about a kid with a magical miniature castle. Through use of a magic token, he can become small enough to enter the castle--and the entire medieval world beyond it. ''Battle'' features a battle with giant rats, which makes sense if you think about it, since the rats in the attic don't have magic tokens...
* In the Russian play ''Theatre/TheInspectorGeneral'' by Creator/NikolaiGogol, one character ''dreams'' of two "Rodents of Unusual Size" the night before receiving a letter that the inspector is secretly coming to his town -- and since he is a corrupt ObstructiveBureaucrat, it's a very bad thing indeed.
** At least one actor used to hold his fingers a few millimeters apart during the scene - it isn't specified the rodents are unusually ''big''.
* ''Literature/{{Redwall}}'': In ''The Long Patrol'', BigBad Damug Warfang is a Greatrat, described as twice the size of a normal rat.
* While the titular rodents of Paul Zindel's ''Rats'' are generally of normal size, the book also features the Rat King ([[Franchise/TeenageMutantNinjaTurtles no, not that one]]), which is described as being even bigger than a capybara.
* In ''Literature/TheBorribleTrilogy'', the race of Rumbles are described as rat-like, and are the size of human children. A TakeThat to WesternAnimation/TheWombles? Surely not.
* In the Creator/SMStirling book, ''[[Literature/TheLordsOfCreation In the Courts of the Crimson Kings]]'', when the protagonist rescued from a prison, his [[TransplantedHumans Martian]] rescuer warns him that the tunnels under Olympus Mons are inhabited by all manner of unpleasant creatures including rodents of unusual size. [[SubvertedTrope They turn out to be thousands of tiny rodents that swarm like army ants.]]
* ''Literature/ParrishPlessis'' has canrats, rat-dog hybrids that are both vicious and intelligent. One of them, the Big One, is the size of a doberman.
* Creator/HGWells' novel ''The Food of the Gods'' features giant rats, about the size of wolves, as part of the mutated ecology that the titular food's unleashed. Unfortunately for humans, the rats also have the carnivorous temperament of wolves and quickly become the dominant pack hunters in the hot zones.
* ''Literature/{{Discworld}}'':
** The Changelings from ''Discworld/TheAmazingMauriceAndHisEducatedRodents'' tend to be larger than ''keekees'' (normal rats), presumably because their intelligence lets them keep themselves better-fed and healthier. Some of the normal rats bred for the fighting-pit by the ratcatchers are also larger than average.
** Implied to be true of the hamster which the Igor from ''Discworld/GoingPostal'' recalls his veterinary cousin having kept, before it [[AttackOfTheKillerWhatever broke out of its treadmill, ate a man's leg, and flew away]].
* The Lemming-Men of Yull from Toby Frost's ''Literature/SpaceCaptainSmith'' books have armed and industrialized themselves, but still retain their love of jumping off cliffs.
* The Doormouse is a once-human businessman in the Literature/{{Nightside}}, who had himself changed into a giant bipedal mouse because he likes being cute and fuzzy. Not a ''dor''mouse; his name came about because he's in the business of renting out use of his CoolGate collection.
** Creator/AlanDeanFoster pulled the same pun in his Literature/{{Spellsinger}} series, although the doormouse (majordomo in a brothel) was in fact a dormouse. (Spellsinger rodents are ''much'' larger than their Earth equivalents, even more so than in [[Literature/TheChroniclesOfNarnia Narnia]].)
* ''Literature/AllQuietOnTheWesternFront'' briefly mentions "corpse" rats, which are basically rats that have gotten huge and fat by [[{{Squick}} eating the corpses of dead soldiers]]. When the men aren't making war on the enemy they are making war on the rats.
* ''Literature/AngelinaBallerina''
* ''Three Skeleton Key''
* The average rat in ''Literature/{{Domina}}'' is about the size of a small dog. That's what happens when you let mad scientists play with a BioAugmentation device.
* The Rh/attes are an aptly-named alien race from ''Chess With A Dragon''.
* In ''[[Literature/MythAdventures Myth-Taken Identity]]'', the mall-rats are about the size of spaniels, while their boss Rattila is twice their size. In the previous book, ''Myth Alliances'', a big rodent-like beast is seen pulling a cart on one of the visited dimensions.
* In ''Fort Freak'', a Literature/WildCards novel, Vincent "Ratboy" Marinelli is an effective member of the Department of Internal Affairs, aka the Rat Squad. He is a "Joker" w/ the shape of a giant (4-foot) brown rat. [[http://wildcards.wikia.com/wiki/Ratboy For a little more, see another wiki.]]
* In Simon Hawke's ''The Wizard of Rue Morgue'', Wyrdrune is ambushed by a rat the size of an elephant in the sewers under Paris.
* Technically true in Wayne Barlowe's ''Expedition'', in that environmental degradation on Earth has become so severe that the (ordinary) Norway rat is the largest wild animal left on the planet.
* In ''[[Literature/DanShambleZombiePI Death Warmed Over]]'', the zombie foreman of a garbage dump has giant rat pets [[AllAnimalsAreDogs that act like dogs]].
* The ''Literature/GraveyardSchool'' book ''Here Comes Santa Claws'' had sentient rats the size of reindeer that could stand upright. Their names are Bomber and Basher.
* In the first ''Tales For The Midnight Hour'' book by J.B. Stamper, a story called ''Phobia'' had a woman with a fear of rats going through the worst night of her life in a city park after dark. She's stalked by a shadowy man who seems to be able to attract rats, and ends up hiding at one point in a rat's nest. Eventually, she learns [[spoiler: the man is actually a humanoid rat, and even though she gets away, the incident has scarred her for life.]]
* In the ''Literature/DredChronicles'', there are mutant rats on the PrisonShip Perdition it's noted that the adults are now too big to fit in the [[AirVentPassageway ducts which people use]].
* The all-too-sapient rats in ''[[Literature/FafhrdAndTheGrayMouser The Swords of Lankhmar]]'' are of standard size -- until the right magic comes into play, late in the novel.
* In an in-Verse example, the populace at large in ''Literature/RatmansNotebooks'' start speculating about a human-sized man/rat hybrid on the loose after the VillainProtagonist begins using his trained SwarmOfRats to commit crimes. Amused, he plays along with these rumors by donning a rat mask on his later criminal forays.
* In ''Literature/WarriorCats'', rats are basically just normal-sized rats, but they're much bigger to cats than they are to humans, and are fearsome and universally loathed. The authors also have joked that the badgers on the cover of ''Twilight'' look like Rodents of Unusual Size.

[[folder:Live-Action TV]]
* ''Series/DoctorWho'', "The Talons of Weng-Chiang" (considered a SpecialEffectFailure in actual execution though)
* ''Series/TheNewAvengers'' episode "Gnaws".
* ''Series/RedDwarf'' has it in "Back in the Red"- ''Red Dwarf'' has been built far too large and is returning to normal size. ''Starbug'' encounter a huge rat and ends flying into its backside, propelling it along.
* The theoretical Shagrat, from ''Series/TheFutureIsWild''.
** The poggle, from 45 million years later in the same program, was a Rodent Of Unusual Staying-power, having survived to be the last mammal on Earth. Not that this did it much good...
* The [[CallARabbitASmeerp Wilddeoren]] in ''Series/{{Merlin 2008}}''. Naked Mole Rats Of Unusual Size.
* On ''Series/SabrinaTheTeenageWitch,'' we hear the Quizmaster on the phone with an exterminator complaining that the rat in his apartment in the Other Realm is making long-distance calls on his phone and listening to his [=CDs=] without putting them back. (Whether he pays rent or not is ''not'' the point.) They are apparently unsuccessful since we meet the ROUS in another episode when he introduces himself as the Quizmaster's "roommate."
* [=SPG=], the pet hamster of Vyvyan on ''Series/TheYoungOnes'', was usually played by a puppet the size of a guinea pig rather than the size of a real hamster. In one episode, he scarfed down an entire potfull of lentils and swelled up to volleyball size.
* In the ''Series/NightGallery'' story "Nature of the Enemy", astronauts find a large metal apparatus on the Moon. Just as the staff at [=CapCom=] have realized it looks like a mousetrap, the landing party's transmission cuts out, then resumes to show an empty space helmet being inspected by a building-sized rat.
* In ''Series/{{Grimm}}'', the Reinigen are Wesen RatMen. However, in "Rat King" it's revealed that some clans of Reinigen have the ability to FusionDance into a 20-foot tall rat called a Riesen Ratte or Rat King.
* Sherman the Ginormouse, a white mouse the size of a two-story house, features in the opening sequence of the ''Series/OddSquad'' [[TheMovie TV movie]].
* In "The Elevator", a segment from ''Series/TheTwilightZone1985'', two brothers discover a series of progressively-bigger giant rat carcasses while searching their MadScientist father's lab.

* The ''[[Music/WeirdAlYankovic Radioactive Hamsters From a Planet Near Mars]]''.
* Green Day had an album cover where a gigantic hamster was attacking society.
* Parry Gripp's ''Hamizilla'', about a hamster {{Kaiju}} who seeks vengeance on humanity in the year 2043.
* There's a New York punk band named ''Rats of Unusual Size''.
* The UsefulNotes/WorldWarI song "The Quartermaster's Store" mentions "rats, rats, as big as bloody cats" (see also RealLife).
* Music/DavidBowie's "Future Legend", the first track of ''Diamond Dogs'':
-->Fleas the size of rats sucked on rats the size of cats.
* A biography of Music/DieArzte is called "Ein überdimensionales Meerschwein frisst die Erde auf" ("A giant-size guinea pig eats Earth").[[note]] In German, the guinea pig automatically gets the diminutive ending -chen, so dropping this suffix already implies the trope. Like in the joke: "Was ist 10 Meter groß und springt von Baum zu Baum? Ein Eichhörn." Untranslatable, of course. [[/note]]

* There's a Japanese legend called "The Boy Who Drew Cats", in which a city is plagued by a giant demonic rat. Which is eventually killed by the drawings of cats by the boy in the title. [[AWizardDidIt It's magical, okay?]]
* Also from Japan, Tesso (Iron Rat), a former human noble with JerkAss, ungrateful parents who was cursed by a monk. He's a man-rat hybrid that raids the temples and the houses with a horde of smaller rats and devour everything in his path.

* This is an [[http://garfield.nfshost.com/1981/09/20/ occasional]] [[http://garfield.nfshost.com/1983/12/10/ gag]] in ''ComicStrip/{{Garfield}}''; Garfield will be pretending to mouse, or maybe teasing a mouse and the [[http://garfield.nfshost.com/1987/11/22/ mouse]] [[http://garfield.nfshost.com/1989/04/03/ will be]] [[http://garfield.nfshost.com/1991/11/08/ larger]] [[http://garfield.nfshost.com/2000/07/21/ than]] [[http://garfield.nfshost.com/2002/11/16/ normal.]] Then there's the [[http://garfield.nfshost.com/1984/12/18/ Training Mouse]] from the arc where Garfield got locked out and found his way back to where Mama Leoni's used to be. And then there's the subverted one where it only *looked* like a really tall mouse, the shot from behind the mouse hole shows it was three mice standing on each other's shoulders.
* The infamous "Moon Hoax", a series of articles in the 19th century New York ''Sun'', included fanciful accounts of giant civilized beavers living on the moon.
* In an early issue of ''ComicStrip/WhatsNewWithPhilAndDixie'', Phil distracts a giant monster rat by throwing a live cat at it.
* A ''ComicStrip/{{Curtis}}'' strip had his little brother Barry worrying about some drug dealers trying to set up shop in an abandoned building across the street from their home. Curtis is unfazed because, as he explains to his brother, there are rats the size of collies living in that building. Cue off-panel screams.

[[folder: Puppet Shows]]
* In the Creator/JimHenson TV adaptation of ''Literature/EmmetOttersJugBandChristmas'', the members of Emmet's band are all similarly-sized Muppets, even though one of them is a ''muskrat'' and should be less than a quarter as large as the other three (an otter, a porcupine and a beaver).
* The UK puppet character Roland Rat, along with all the other rodent characters in the Roland Rat setting, is about four feet tall. And it's not just that the puppet is four feet tall, because he routinely interacts with humans.

[[folder:Tabletop Games]]
* In the ''TabletopGame/{{Warhammer}}'' world, between the Winds of Magic and underground [[GreenRocks Warpstone]] deposits, it's no surprise that sewer rats can grow to the size of wolves. Some say there is even an entire race of RatMen called the Skaven that walk upright and breed ferocious mutant rodents the size of ogres as enormous war beasts, some covered with spikes or with blades instead of arms or with multiple heads, [[FlatEarthAtheist but any credible scholar will dismiss these claims as the raving of lunatics]].
* ''TabletopGame/Warhammer40000'':
** The underhive in ''TabletopGame/{{Necromunda}}'' (and in most [[LayeredMetropolis Hive Cities]] around the galaxy, most likely) is infested with these. And not just any giant rats -- intelligent, mutated giant rats. Some are spiky, some have two heads, but they all are happy to eat lone humans if they think they can get away with it. Of course, humans are more than happy to return the favor. While the uppermost Hive Dwellers might feast on food exported from agri-worlds, the average Underhiver has a distinctly less pleasant variety of foodstuffs to choose between, and rat meat will serve just fine. The Underhive even hosts a faction known as the Ratskin Renegades, whose theme is based on First Nations plains tribes, with ROUS filling in for bison and horses.
** The Hrud of the same universe , sometimes called [[RecycledInSpace "Space Skaven"]], might also qualify, at least before their appearance was {{Retcon}}ned to some sort of squiddish thing.
* ''TabletopGame/DungeonsAndDragons'':
** "Dire rats" are a common low-level monster that often show up in caves and city sewers. They're scavengers who won't hesitate to attack live prey if they think they can get away with it and carry disease more often than not. There are also [[OurWerebeastsAreDifferent wererats]], humanoids cursed to change into dire rats much like werewolves.
** And there's the Rylkar from Version 3.5's ''Monster Manual V''. They're basically a nest of giant, evil rats who are connected via a hive mind to their harridan, the huge, disease and corruption-spreading, blind matriarch of the nest.
** The ''TabletopGame/{{Spelljammer}}'' supplement for 2nd edition D&D introduces the infamous [[http://en.wikipedia.org/wiki/Giant_Space_Hamster Giant Space Hamsters,]] domesticated and bred by the GadgeteerGenius Tinker Gnomes of Krynn, and coming in a wide variety of breeds including the "Miniature Giant Space Hamster", which is identical to an ordinary hamster. The good news is, the base breed is relatively docile and non-dangerous (so much as any creature the size of a brown bear can be non-dangerous). The bad news is, the breeders being ''Tinker'' Gnomes, sanity and common sense place no limits on the kind of breeds they make (breeding a carnivorous and flying variety was deemed "an understandable line of inquiry").
** Previous editions of D&D also included giant beavers, giant porcupines, and -- I kid you not -- ''giant carnivorous flying squirrels''.
** [[Webcomic/VGCats Rat flail.]]
** [[Manga/{{Bleach}} Rat MORNING STAR!]]
** One highly popular adventure from the early days of ''Dungeon'' magazine shrank the [=PCs=] down to the size of gaming miniatures, making ordinary rats appear enormous by comparison. Other humanoids, who'd previously fallen victim to the same magic, used rats as steeds.
* ''TabletopGame/MagicTheGathering'' has Rat as a creature type, from the classic [[http://ww2.wizards.com/gatherer/CardDetails.aspx?&id=77 Plague Rats]] that only the four-of-a-card deck construction limit really keeps from growing arbitrarily dangerous to the Kamigawa block's nezumi (rat-people complete with their own warriors, rogues, shamans and ninja).
** [[http://ww2.wizards.com/gatherer/CardDetails.aspx?&id=135236 Relentless Rats]] was designed and printed to allow people to enjoy plague rats without the four-of-rule, explicitly stating that it ignores it. Also is much better.
** The original art of [[http://gatherer.wizards.com/Pages/Card/Details.aspx?printed=true&multiverseid=153 Giant growth]] featured a giant rat. Now it's a bear.
* An enemy from ''TabletopGame/VampireTheMasquerade'' is called a Ghoul Rat. It is the size of an Irish Wolfhound.
** There is also a changing breed in the World of Darkness called the Ratkin, that are sometimes born as humans (that have the ratkin genetics) and contract a disease that, should they overcome it, turns them into wererats. They were given the charge by Gaia to help control the human population by eating their food and spreading disease.
*** These Ratkin can take a talent to be able to transform into a giant rat that can stand approx. 4 ft. at the shoulders.
* In ''TabletopGame/{{Shadowrun}}'', devil rats are Awakened rodents the size of a border collie. They're nasty, vicious, disease-carrying, and (for some reason) bald all over.
* The TabletopGame/NewWorldOfDarkness has Beshilu, one of the two iconic races of the bizarre half-spirit Hosts (the other being the [[GiantSpider Azlu]]). Like their cousins, they start off looking like normal rats, but quickly gain size and sentience as they eat real rats and lesser Beshilu. They then gradually gain the ability to [[EverythingsDeaderWithZombies control human corpses]] and eventually become humanoid, where they become far more social then other Hosts, forming tribal societies. That wouldn't be so bad-they don't prey on humans all that much-except that they also are driven by instinct to gnaw holes in the barrier between the SpiritWorld and the human one, which, given where they live (i.e., where normal rats live), quickly becomes a haven for disease-spirits, who of course, [[CaptainObvious exist to spread disease]]. And like other hosts, killing them simply causes a large one to [[AsteroidsMonster split into a swarm of rats]], with one of the component rats containing his soul-which, if left alone, [[FromASingleCell will eventually grow back to full size and power]].
* ''TableTopGame/{{Pathfinder}}'' features the usual assortment of giant rats featured in most tabletops, with a welcome addition; the friendly, gentle capybara (see RealLife, below), also called the donkey rat, is available for use as a familiar by spellcasting classes. It has one of the largest rodents of any D&D setting with the Goblin Dog, which is a furless, disease-carrying rat so big that goblins [[HorseOfADifferentColor ride it like a horse]].
* ''TableTopGame/YuGiOh'' has, uhm, [[http://yugioh.wikia.com/wiki/Giant_Rat Giant Rat]]... [[ExactlyWhatItSaysOnTheTin Pretty self-explanatory]] and pretty useful for a player who uses Earth-Attribute monsters.

* ''Toys/{{Bionicle}}'': the Kuma-Nui, a large combiner figure built of two already decent-sized models, was a rat. A rat with an extendable neck, gorilla-arms and tank-threads for legs.
* ''Franchise/{{Transformers}}'': Rattrap, from WesternAnimation/BeastWars, who turns into a rat the size of a person.

[[folder:Video Games]]
* ''Videogame/DeadlyRoomsOfDeath'' has lemmings, which only appear in one level of the official level sets. Most of the rest of the time, this acronym stands for "Roaches Of Unusual Size".
* ''Franchise/{{Pokemon}}'' has quite a few of these, often ComMons. Examples include Rattata, Pachirisu, and of course, the Pikachu family. They are usually cute, big eyed and not very menacing. Not even those with teeth bared are all that terrifying.
** Raticate is slightly more intimidating than some of the others. And extremely annoying if you're up against one with that much hated Super Fang move.
** Averted by the Bidoof family, as they are based on beavers, which really do get that big.
* ''VideoGame/UltimaUnderworld II'' features giant rats of various types.
* ''VideoGame/BreathOfFireI'' does the small player thing, but with cockroaches. Later games didn't bother with that, and simply had giant roaches
* ''VideoGame/{{Fallout}}''
** ''VideoGame/{{Fallout|1}}'' has rats the size of the vault dweller's foot.
*** For ''starters''. [[SortingAlgorithmOfEvil Pig rats are the size of the vault dweller's leg, and mole rats, the vault dweller]].
** ''VideoGame/{{Fallout 3}}'' has a robot you can activate in the Old Olney Tunnels that mentions something during its startup sequence about an infestation of rodents of unusual size. [[spoiler:It is usually torn to pieces soon after by the 10 foot tall Deathclaws infesting the tunnels]].
** ''VideoGame/FalloutNewVegas'' has a direct quote from ''Film/ThePrincessBride'' (see quote at top) when doing the Debt Collector quest's final part in Broc Flower Cave, which is of course filled with [[ExactlyWhatItSaysOnTheTin Rodents of Unusual Size]]. Though this will only happen if you have the Wild Wasteland perk.
*** That is, unusually sized Rodents of Unusual Size
* ''Franchise/TheElderScrolls'':
** The series in general has these as a standard for all rats. Most games also include at least one RatStomp quest dealing with them.
** ''[[VideoGame/TheElderScrollsIIDaggerfall Daggerfall]]'' has large rats in the starting dungeon.
** ''[[VideoGame/TheElderScrollsIIIMorrowind Morrowind]]'':
*** Has them as a low level enemy that also frequently carries disease. The ''Tribunal'' expansion allows you to but a trained "Pack Rat" as a pet, who will follow you and help carry your gear/loot.
*** In the Grazelands, there is a bugged creature spawn point that causes creatures spawned there to be twice their normal size. One of the creatures that can be spawned there is a rat, making for a [[UpToEleven Rodent of Exceptional Size]].
** ''[[VideoGame/TheElderScrollsIVOblivion Oblivion]]'':
*** Has a vast array of underground catacombs and Romantic secret passages lit by torchlight. [[Literature/{{Discworld}} It was damp. There were rats.]]
*** There's a woman in one of the cities that keeps pet rats. Her rival hates them, and so put out meat to lure them, which had the effect of attracting mountain lions which came and killed a few of the rats. (The lions were surprisingly weak in battle compared to the ones you usually fight in the wild due to being starved.)
** In ''[[VideoGame/TheElderScrollsvSkyrim Skyrim]]'' they're called "skeevers". They're so big that people lay down ''bear traps'' to catch them. One crazy mage even tries to create an army of them in one quest. At least one NPC notes that the skeevers used to be smaller.
* Twitch, a champion in ''VideoGame/LeagueOfLegends'', was a sewer rat who gained sentience and bipedal form from magical runoff. [[SingleSpecimenSpecies Lonely]] and a bit maniacal, his goal is to duplicate the phenomenon and create a race of sentient rats to rule over.
* In ''{{VideoGame/Majesty}}'', giant rats were generally the first monsters to show up in your kingdom. Rat-men were another common annoyance, though they were at least one of the few enemies your city guard could handle competently.
* ''VideoGame/PuzzleQuest: Challenge Of The Warlords'' has giant rats, scorpions, bats, and wasps. The first two can be captured and ridden, granting the player a different stat bonus and additional spell, depending on which one you choose.
* ''Videogame/SuikodenII'' had a giant, mutated Sewer Rat for a boss. Which could attack twice per turn, and hit all of your party with each attack for a ''lot'' of damage. {{Goddamn|Bats}} [[JustForPun rats.]]
** ''Videogame/FinalFantasyIII'' had one too. It is unusual, in that it is a normal-sized rat, but your ''party'' has to use the ''Mini'' condition to reach the PlotCoupon it's guarding. Since the ''Mini'' status effect cuts Defense and Attack to 1, you're basically forced to go at it with a party of {{Squishy Wizard}}s. Best bet is to change your physical fighters into Red Mages for the duration of the dungeon, since you don't have the advanced spells they're locked out of at this point of the game.
*** ''VideoGame/TalesOfSymphonia'' has a similar situation where the party gets shrunk down in a sewer and meets the same itty bitty mice which they can encounter as GIANT KICKBOXING MICE.
* ''VideoGame/ShiningForce 2'' has rat enemies of both varieties as the above examples. On the first battle on the field, the party encounters Huge Rats. Later in the game, the party gets shrunk down as part of the storyline and faces normal-sized rats. Your stats don't suffer the debilitating effects of Mini like in FFIII, but those normal rats are still hella strong. And led by a super-rat named Willard.
** Not to mention Slade the rat thief who started the entire mess in the game by stealing the Jewels of Light and Evil. Including him in the fight with Willard causes instant FurryConfusion because Slade is anthropomorphic.
* In the "Down the Tubes" and "Tube Race" levels of ''VideoGame/EarthwormJim'', the only way to get through several corridors full of tiny bruisers who will slam you around and throw you back where you came from is to ride a giant, foe-eating hamster (''"Whoooooooa Nelliiiiiiiie!"'').
* The ''VideoGame/MagiNation'' series mostly features decidedly non-real-looking creatures, but the AlwaysChaoticEvil Core region does get one very large rat-like creature. It's even named "Rous," in a direct ShoutOut to the {{Trope Namer|s}}.
* Mouser from ''VideoGame/SuperMarioBros2'' is a gigantic bomb throwing killer mouse boss. Who has probably the most ironic kind of name ever for such a creature (considering the word 'mouser' means 'cat which catches mice').
* ''VideoGame/{{Everquest}}'' and ''Videogame/EverquestII''' have regular giant rats, usually found in sewers and other dark areas.
* Every roleplaying game Creator/SpiderwebSoftware has ever made, with the exception of the original ''VideoGame/{{Geneforge}}'', has giant rats in it. They're usually the very first enemies you fight before you go on any quests.
* ''VideoGame/CastleOfTheWinds'' has Giant Rat, but it's pitifully weak. No, it's the ''ants'' that new characters should watch out for.
* ''VideoGame/AdventureQuest'' has BURPS, which stands for "Big Ugly Rat Pests". They're ExactlyWhatItSaysOnTheTin. And every other year there's a war fighting nothing BUT those guys. They also qualify as GoddamnedBats because they're a pain in the ass to hit, where as the bigger ones deal quite a bit of damage. At higher levels you'll still be fighting the guys, often in groups.
** It gets better--one of their [[UndergroundMonkey variants]] is actually called the ROUS.
* ''VideoGame/ParasiteEve'' had mutated rodents that tried to kill you. And giant squirrels, too.
* ''Rattus giganteus'' is a common creature in ''VideoGame/BeyondGoodAndEvil.'' While it's not as big as other examples of this trope (nor as its name would suggest), it occurs in such numbers that [[GoddamnBats it's still a hindrance.]]
* ''VideoGame/ProjectEden'' features normal sized rats that [[ShapeshifterBaggage transform]] into giant [[NightmareFuel acid spraying monstrosities]]
* Played for laughs at the start of ''Videogame/TheBardsTale'', where the eponymous Bard goes into the basement of a tavern to kill a rat for the hostess. After some patronising dialogue from the narrator, a giant rat emerges from the darkness, and ''[[BreathWeapon breathes fire]]'' on the Bard, forcing him to retreat back above ground. Turns out it was all just a prank, which the drunken patrons got a good laugh out of.
* ''VideoGame/DuckTales'' for the NES had that giant rat boss guarding the Green Cheese treasure in The Moon stage.
* Played with in ''VideoGame/BaldursGate'', where Minsc's pet rodent Boo is an unusually ''small'' "miniature giant space hamster". "Go for the eyes, Boo!"
* ''VideoGame/BaldursGateDarkAlliance'' features groups of large rats in dungeons.
* The Kodama Rats in ''VideoGame/LaMulana'', which explode.
* The bonus-content version of the credits from ''[[VideoGame/NancyDrew Resorting To Danger]]'' includes a clip of Casper the albino squirrel, grown to the size of an elephant, destroying the laboratory by shooting [[FrickinLaserBeams laser beams]] [[EyeBeams from his eyes.]]
* ''VideoGame/MirrorsEdge'' breaks realism to include one, if you fire at a certain sign with a sniper rifle.
* ''VideoGame/ResidentEvilOutbreak File #2'' features those rats that spread the T-Virus attacking one of HUNK's men after he'd been felled by Birkin. There was also artwork showing muntant rats that didn't make the game.
* ''VideoGame/EarthBound'' features a Sanctuary Guardian called the Plague Rat [[DoomyDoomsOfDoom of Doom]].
* In the Human Noble origin in ''VideoGame/DragonAgeOrigins'', you fight a bunch of giant rats who got into the kitchen larder. However, they aren't really that big; a foot, maybe a foot and a half long.
* ''VideoGame/DarkCloud 2'' fills several levels of its sewer with them.
* Giant rats were the most basic enemy type in the ''VideoGame/{{Gauntlet}}'' clone ''Demon Stalkers''.
* The UsefulNotes/GameBoyColor versions of the ''VideoGame/HarryPotter'' games feature giant rats as enemies.
* The Rat-Men from ''VideoGame/TitanQuest''. You first fight the weak, thin ones in Greece and then meet their larger, [[DemonicSpiders strongers]] cousins in Orient.
* The Wolf-Rats from ''VideoGame/{{Drakensang}}''. Expecially [[ThatOneBoss Mother Ratinsky]] and [[BonusBoss Great Chief ''Rat''zinger]].
* ''VideoGame/TheSimsMedieval'' has dire ''[[KillerRabbit chinchillas]]''.
* The Mice monsters in ''VideoGame/{{Miitopia}}'' are Mii-sized rodents. While much, much cuter than the average supersized mouse, they are not less aggressive than them.
* Creator/FromSoftware:
** ''Videogame/DarkSoulsI'' has Plague Rats. Very predictable and easy to kill but inflict poison. The biggest one is a single Giant Rat in the Depths, which is roughly the size of a bus.
** ''VideoGame/DarkSoulsII'' introduces an even bigger rat in the form of the Royal Rat Authority boss. Strangely enough, the actual Rat King is only about the size of a small dog (but is intelligent and capable of speech).
** ''VideoGame/DarkSoulsIII'' has Hound Rats. Unlike the Plague Rats, they cannot inflict poison.
** ''VideoGame/{{Bloodborne}}'' has Labyrinth Rat, malformed rats with [[BodyHorror enlarged eyes and lumps on their back]].
* In ''VideoGame/{{Battletoads}}'', large humanoid rats are the Dark Queen's primary contingent of {{mooks}}.
** There's also "Big Bad Blag" which is a giant, fat anthropomorphic rat even larger than the toads themselves.
* ''VideoGame/DukeNukemForever'' has regular-sized rats attacking Duke... after he's been hit by the effects of a [[IncredibleShrinkingMan shrinking device]]. Duke then quips "''Talk about your rodents of unusual size!''"
* Giant rats are mentioned in VideoGame/FallenLondon, though they aren't as much of a problem for most people as the normal-sized but sentient and mechanically inclined rattus faber (more commonly called "L.Bs".
* Giant rats are quite common monsters in ''VideoGame/RuneScape'', especially in lower level areas
* ''Videogame/{{Arcanum}}'' has rock rats and the larger granite rats.
* ''Videogame/PlanescapeTorment'' includes the ''TabletopGame/DungeonsAndDragons'' monsters, cranium rats and wererats, mentioned above.
* ''VideoGame/TombRaider'' has rats that are at least the size of a medium-sized dog once you reach the "Cistern" stage in the Roman section of the game, given how other animals were generally a believable size up to this point, [[NightmareFuel/TombRaider it was noticeable.]]
* ''{{VideoGame/Metro 2033}}'' and ''VideoGame/MetroLastLight'' feature a number of seemingly rodent-derived monsters among their menagerie of radioactive mutants. Lurkers are small, fast creatures that resemble oversized naked mole rats, while the larger and more vicious nosalises look more like they were originally moles or shrews of some sort. Both mutants are incredibly hostile and have an acute taste for human flesh, with the nosalises in particular having developed [[MoreTeethThanTheOsmondFamily massive, fanged maws]] that can easily rip people to shreds. Watchers/Watchmen are harder to place; they have some rat-like features, like their hairless tails and ability to stand on their hind legs, but overall seem more like wolves instead (hunting in packs, howling, etc...).
* ''{{VideoGame/Borderlands 2}}'' has enemies called R.O.U.S. (initials abbreviation of the trope name) while playing on True Vault Hunter Mode. They are human experiments with rodent-esque features escaped/released from the Hyperion corporation and usually appear alongside other rat-themed enemies. They're called Lab Rats on the regular difficulty and Mutated Lab Rats on Ultimate Vault Hunter Mode.
* ''VideoGame/NetHack'' has giant rats, but even for a newly-created character they're pretty much cannon-fodder. The [=UnNetHack=] variant also includes Enormous Rats.
* ''VideoGame/DwarfFortress'' has two separate varieties of oversized rats, both found BeneathTheEarth: large rats are bigger than an adolescent dwarf, surprisingly quick, and adept food thieves. Giant rats are over three times the size of grown dwarves, likewise steal food, and are used as [[HorseOfADifferentColor mounts]] by goblins during sieges.
* ''VideoGame/PinkPantherHokusPokusPink'': While in Siberia, Pink encounters an underground living group of giant, intelligent, antropomorphic rats. He has to get their help [[ItMakesSenseInContext to create an earthquake]].

* Giant mutant rodents are the signature creation of ''Webcomic/{{Narbonic}}'''s Helen Narbon. Of course, Helen being a young girl at heart, they happen to be giant mutant ''gerbils''.
* The trope name is evoked in the title of an ''Webcomic/EightBitTheater'' [[http://www.nuklearpower.com/2005/07/12/episode-575-rats-of-unusual-size/ episode]] which discusses dire rats... but the resulting rodent isn't one, just an AxCrazy dwarf disguised to chase for it.
* The Sturmhalten sewer guides in ''Webcomic/GirlGenius'' are actually ''surprised'' to learn that sewer rats [[http://www.girlgeniusonline.com/comic.php?date=20060501 aren't supposed to be giant and glowing.]]
** "60 centimeters. Tops."
*** Lars is understandably worried.
*** Even so, sixty centimeters is pretty sizeable for a rat; especially since, during the approximate time period Girl Genius takes place in (assuming sometime during the 1700s, given a couple hints), the most prevalent variety would be the black rat, as the Norway rat was at that point only getting started driving the black rat to warmer areas. Norway rats are noticeably bigger than black rats, and even for them, sixty centimeters (about two feet) tip-to-tail is pretty big.
* Not surprisingly, FurryComic ''SuperMegatopia'' has several larger anthropomorphic rodents, including Distraction Damsel (though she's only really big [[MostCommonSuperpower where it counts]], [[{{Superman}} Mighty Mighty Hamster]], and of course, the [[AttackOfThe50FootWhatever World's Largest Hamster]].
* ''Secretary'', the second arc of' 'Webcomic/NatureOfNaturesArt'', plays with this trope. All of the important characters are rodents in this arc, and some are bigger than others. In the end, though, the only one who plays the trope straight is the advanced class teacher - he makes degus (SV and NT) and chinchillas (SV's teacher) look ''small'', and early in the arc, a mouse called NT "huge".
* Hamstard, the Bastard Hamster mascot of ''Webcomic/{{Erfworld}}'''s in-character blog, qualifies by virtue of being incredibly fat. Really, Parson should've gotten the little blob an exercise wheel before being swept off to another dimension...
* In the ''Webcomic/BladeOfToshubi'' we have Toshubi, a human-sized anthropomorphic mouse from a village of human-sized anthropomorphic mice.
* In ''Webcomic/{{Yamara}}'', Tim the paladin is turned into a vampire, but messes up his first attempt to turn into a bat, becoming a giant flying squirrel instead.
* In ''Webcomic/{{Weregeek}}'', when the GM mentions rodents of unusual size attacking the party, they protest that given their statistics of rodent encounters, that size is the ''usual'' one.
* ''Webcomic/CrewDogs'': Rodents of Unusual Size live in the ceiling spaces, and are known to feed on [[EnsignNewbie Second Lieutenants.]]

[[folder:Web Original]]
* Actually older than WebOriginal, as it goes back to Usenet, the [[http://cgi.cs.indiana.edu/~oracle/ Internet Oracle]] has as his arch enemy Woodchucks. The reason is the infamous Woodchuck question he is constantly asked, "How much wood could a woodchuck chuck if a woodchuck could chuck wood?". Some of his enemy woodchucks were rather large. After ''Film/ThePrincessBride'' came out, they were given the official name of "R.O.U.S.".
* [[http://www.kongregate.com/games/nerdook/monster-slayers Monster Slayers]] features these as one of the enemies.
* {{Kizzsprite}} is a chinchilla, resurrected as a kernelsprite. Of course, much weird plot shit surrounds him. We probably shouldn't get any further than that.
* ''[[WebOriginal/{{Mortasheen}} Morta]][[http://www.bogleech.com/mortasheen.htm sheen]]'' has a few, including the amoebic; thieving [[http://www.bogleech.com/mortasheen/gravesnitch.htm Gravesnitch,]] the oddly-toothed [[http://www.bogleech.com/mortasheen/gnawful.htm Gnawful,]] the cold-loving [[http://www.bogleech.com/mortasheen/abomignash.htm Abomignash,]] and the absolutely disturbing [[http://www.bogleech.com/mortasheen/vermoeba.htm Vermoeba]] (which is based on the Rat King detailed below)
* [[WebVideo/Jerma985 Jerma985's]] video, "Rat Movie", features a mischief of rats led by [[MemeticMutation The Giant Rat that Makes All of the Rules]]. When said Giant Rat dies, another one of the rats grows in size and becomes the next Giant Rat.

[[folder:Western Animation]]
* An episode of ''WesternAnimation/AladdinTheSeries'' featured rat people, who were only slightly shorter than Jasmine and Aladdin.
* Played straight with ''Franchise/AlvinAndTheChipmunks''. In addition to possessing human-like faces and ears, the Chipmunks and Chipettes were originally human-sized, making them more like chipmink-shaped humans in ''WesternAnimation/TheAlvinShow'', 80s TV series and films. This later became averted in the CGI/live action films when they were the size of actual chipmunks in real life.
* In ''WesternAnimation/BackAtTheBarnyard'' when everyone got a clone, said clones were all mini-sized... except Pip's, who went the other way.
* ''WesternAnimation/Ben10Omniverse'': Rook picked up his impressive fighting skills defending his planet's wheat silos from the local rodents, which, according to him, "Run fairly large."
* In one ''WesternAnimation/SuperFriends'' episode, Sinestro creates a giant rat to attack the heroes; GreenLantern handles it by using ''his'' ring to create a giant ''cat'' to chase it away.
* Gorgonzola from ''WesternAnimation/{{Chowder}}''. Also, overabundance of giant rats is apparently why Mung [[IdiotBall keeps poison in the spice cabinet]].
* One episode of ''WesternAnimation/{{Cyberchase}}'' involved The Hacker using a giant hamster called a hamborg (which for some reason resembled a capybara) as part of his evil plan.
* That ''WesternAnimation/FamilyGuy'' episode about the world being destroyed by [[http://en.wikipedia.org/wiki/Year_2000_problem Y2K.]] The Griffins leave Joe to fight a giant mutant rat. His response? "Bring It On!!!"
* In the when-nightmares-attack episode of ''WesternAnimation/GIJoeARealAmericanHero'', Lowlight is revealed to have recurrent bad dreams about hybrid rat/car horrors stalking him at night in his father's junkyard.
* ''WesternAnimation/GodzillaTheSeries'' featured the titular reptile chasing down giant rats in New York City in an episode entitled "Cat and Mouse."
* Professor Ratigan from the Disney movie ''Disney/TheGreatMouseDetective'' insists on being called a big mouse even though he looks like like a rat. In his defense he was a mouse in the original book series.
* ''WesternAnimation/InvaderZim'' had Peepi the hamster. Zim used his newfound knowledge of the human weakness to cute things to make Peepi into a virtually unstoppable monster.
** ...of course, then he realized he had no way to control said unstoppable monster, leading to an EnemyMine situation.
* An episode of ''WesternAnimation/JimmyTwoShoes'' featured a rat bigger than a horse attacking [[FatIdiot Beezy]].
* More than one cartoon from ''WesternAnimation/LooneyTunes'' involved Sylvester '''thinking''' he's encountered this trope, but it's really a young kangaroo that keeps swapping places with the mouse he's after and smacking him around.
** In the WesternAnimation/LooneyTunes ''WesternAnimation/TheGreatPiggyBankRobbery'', Duck Twacy follows footprints to a teeny-tiny mousehole and deduces the criminal Mouse Man is inside. He shouts "Come on out, ya rat!" and a HUGE snarling rat-in-a-suit pops out looming over Twacy, who whimpers "*gulp*...go...back...inside."
** In the ''WesternAnimation/WileECoyoteAndTheRoadrunner'' cartoon "Chariots of Fur", Wile E. tries to catch the Roadrunner with a giant mousetrap. Instead, he snags a giant mouse, who then turns the tables on him.
* The Creator/TexAvery classic ''WesternAnimation/KingSizeCanary'' has a cat trying to make a decent meal out of a puny canary by feeding it fast-growth plant food. It works alarmingly well, and soon the cat, the bird, a mouse, and a bulldog are all taking swigs of the stuff, jockeying for size supremacy. The cartoon ends with the cat and mouse waving goodbye to us, standing on a relative beach ball sized planet Earth.
* ''WesternAnimation/ThePenguinsOfMadagascar'' features King Rat, a tall, muscle-bound mutated lab rat who occasionally leaves the sewer to make trouble for the penguins.
* ''WesternAnimation/TheSimpsons''
** In an early episode, Bart is [[LittleKnownFacts convinced]] by Sherri and Terri that the ''Mayflower'' left England to escape from giant rats.
** While not a direct example, Homer once fantasized Lisa as a Princess, Marge as a Queen and Bart as a giant rat. Giant rat Bart then chews on the wall, which he was actually doing outside of the fantasy.
** Though a more literal example would be the Treehouse of Horror episode "Terror of Tiny Toon" in which Bart and Lisa are trapped inside the TV being hunted down by a murderous Itchy and Scratchy. In which Itchy is about the same height as the kids. Though it is averted when Itchy enters the "real world" and becomes the size of a normal mouse.
* ''WesternAnimation/SouthPark'' was attacked by giant carnivorous guinea pigs. The guinea pig community was quite full of {{Squee}} over it.
* ''WesternAnimation/TheTick'' had Speak, his pet capybara (see Real Life, below), much to [[{{Sidekick}} Arthur's]] dismay.
* In ''WesternAnimation/TomAndJerry'', Jerry pulled the same trick quoted above with Sylvester on Tom, with a ''baby elephant''.
** On the topic of Tom & Jerry, one classic had Jerry become a giant at the end because of a growth chemical he had concocted.
* In ''WesternAnimation/TransformersBeastWars,''[[note]]and its sequel series, ''WesternAnimation/BeastMachines''[[/note]] Rattrap's rat mode is shown being significantly larger than normal rats. This is especially unusual in that Transformers has previously shown a willingness to show characters alternate forms as being significantly smaller than their robot modes would indicate (Megatron, Soundwave, Blaster, etc.).
** Justified In-Universe in that the purpose of the beast mode is not for disguise (though that could be a bonus for some), but rather to protect from energon overload: as such, size was not a priority.
** In the cartoons, the Maximals and Predacons of ''Beast Wars'' were smaller descendants of the Autobots and Decepticons. The IDW comics have [[CanonForeigner brought in some Beast-era characters to their G1-based universe,]] made them Autobots and Decepticons, and sized them up to fit in with the general populace. Rattrap is one of them, meaning his rat mode is apparently the size of a ''car''.
* In ''WesternAnimation/CourageTheCowardlyDog'', a reoccurring character who occasionally helps Courage out is a giant anthropomorphic rat named Mr. Mouse.
-->'''Courage:''' Thanks, Mr. Mouse!\\
'''Mr. Mouse:''' No prob.

[[folder:Real Life]]
* The [[http://en.wikipedia.org/wiki/Capybara capybara,]] a South American rodent related to the guinea pig, ''it's the size of a St. Bernard''.
* The prehistoric rodent ''Josephoartegesia monesi'', biggest ever: its incisors were a foot long (Roughly 30 cm), it stood ''five feet at the shoulder (1.52 m) and was ten feet long (3 m) from nose to tail'', and was estimated to weigh ''a ton''. That is the size of a ''full-grown cow!''
* Trench rats in UsefulNotes/WorldWarI were often reported to grow to the size of house cats, because of their constant gorging on the corpses in No Man's Land and the soldiers' food. And when feasting on the corpses, these bloated rats [[EyeScream ate out the corpses' eyes first]]. [[http://www.firstworldwar.com/atoz/rats.htm This site]] has a little article about the trench rats in UsefulNotes/WW1. Imagine sleeping with overgrown, bloated rats the size of a house cat running across your face. Nightmare fuel, no?
** There is an entire episode of the t.v. show ''Monster Quest'' that deals with sightings of cat or even dog-sized rats in major U.S. cities like New York, including a homeless man who reported a 3-foot giant in an abandoned subway tunnel.
* In waterways around the US, [[http://en.wikipedia.org/wiki/Coypu Coypu,]] also known as nutria, (once farmed for their fur) have established breeding populations. These semiaquatic mammals are actually from a different family of rodent than rats, and are ''supposed'' to be the size of tomcats. When the fur trade collapsed, fur farmers turned them loose and they've become quite the destructive pest since, destroying aquatic vegetation, digging out riverbanks and causing collapses, and spreading some rather unpleasant diseases. They're considered one of the worst invasive species in the world.
** If you ever see a "giant killer rat" in a sideshow, it's probably a coypu. (They used to use capybaras, but those are incredibly high-maintenence.)
* The Gambian giant pouched rat can grow to over 2' long, and is one of the largest rodents to be formally classified as "rats". They've playful herbivores which have been trained to sniff out land mines in Africa, which kinda subverts this trope's "feared, flesh-rending predator" aspect.
* The tragically critically-endangered [[http://en.wikipedia.org/wiki/Cloud_rat Cloud Rats]] of the Philippines. As cute as living stuff toys!
* [[http://en.wikipedia.org/wiki/Indian_giant_squirrel The Indian Giant Squirrel]] is aptly named.
* And according to [[http://www.guardian.co.uk/environment/2009/sep/07/discovery-species-papua-new-guinea this article,]] the largest known rat of unusual size has recently been discovered in a crater in Mt. Bosavi. And it's completely docile, too.
* Prehistoric rodents could get absolutely gigantic, aside from the above-mentioned ''Josephoartigasia monesi'': ''Neochoerus pinckneyi'' is a Capybara 40% larger than its modern cousin (200-250lbs); ''Castoroides'', a beaver the size of a VW Bug (8ft long, 200+ lbs); ''Phoberomys pattersoni'' is one of largest of all known rodents, growing to almost 10ft in length with an additional 4ft of tail, weighing up to 1,500lbs. A lot of these giant South American rodents are basically even bigger capybara.
* Tehran, Iran, currently suffers from a severe rat infestation, with an estimated 25 million black and Norway rats occupying a city with about half that many people. Some of the rodents reportedly grow to at least 16 inches long and 5 pounds in weight, suggesting these might actually be of a larger species that's begun to displace the others. Iran is what used to be Persia; what animal do we associate with Persia?
* Ironically, millions of medieval people probably ''owe their lives'' to the arrival of RodentsOfUnusualSize, namely the spread of the larger Norway rat into territories previously occupied by the black rat. Of the two major rat species that infest human communities, the smaller black rat is far more prone to transmit bubonic plague to humans via its fleas, so the Norway rat's displacement of its weaker cousins throughout much of the world helped to reduce the frequency and severity of plague outbreaks.
* Breeders of fancy rats have begun developing varieties for the pet trade, including a "goliath" strain intended to be larger than usual. As such breeding programs are just getting started, "goliath" rats will need many more generations before they're even double the size of normal fancy rats.
* In Creator/DavidSimon's book ''Homicide: A Year on the Killing Streets'' about his shadowing of the Baltimore PD's Homicide Unit during their 1988 working year, the detectives notice an enormous street rat chasing a cat across the street. As this happens right after the infamous Latonya Wallace murder case, which unites the whole neighbourhood and has drug dealers lining up to help the police with their investigation and generally turning the usual "never talk to cops" neighborhood paradigm on it's head, Simon notes the symbolism of the reversal..
* "Scabby the Rat" is a giant-rat inflatable mascot used by labor unions in the eastern United States as a picketing display. Court cases in defense of the unions' right to display Scabby have ruled that showing him constitutes protected speech under the First Amendment, striking down attempts to ban such inflatable figures' use for non-commercial purposes.