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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''': [[TropeNamer Rodents of Unusual Size]]? [[TemptingFate 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]], AsYouKnow, 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.

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. Subtrope of AnimalsNotToScale. 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.

When rodents are unnaturally large, walk upright (at least some of the time) and have human-like intelligence, you have RatMen.

----
!!Examples:

[[foldercontrol]]

[[folder:Anime]]
* ''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.
* Aside from the stuff mentioned in VideoGames, one ''{{Pokemon}}'' episode had a giant robot Pikachu.
[[/folder]]

[[folder:Comic Books]]
* 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 [[{{Neverwhere}} Below]], or that there were any tooth marks on the bones.
* In the ''JudgeDredd'' universe they have these. After examining the meat from one they decide to farm them in place of the 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 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 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 {{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 ''TheElementals'' was a wererat who had a crush on Fathom.
[[/folder]]

[[folder:Commercials]]
* 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.
[[/folder]]

[[folder:Film]]
* [[TropeNamer Named]] after the R.O.U.S. from ''Film/ThePrincessBride''. (When Wesley tells Buttercup that he thinks they 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 ''TheNuttyProfessor'' movies, the Professor accidentally creates a giant hamster.
* The Cantina Scene in ''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]].
** And later in ''ANewHope'', Luke describes "womp rats" as being "not much bigger than two meters."
* The anthology-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 ''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 ''[[TheAmityvilleHorror Amityville Dollhouse]]'' transforms a regular mouse into a giant one. It dies when the house 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 ''NightAtTheMuseum'' plays this trope straight from inch-tall Octavius's POV.
[[/folder]]

[[folder:Literature]]
* ''1984'' 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}}. [[WhyDidItHaveToBeSnakes And 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 JamesHerbert trilogy of novels: ''The Rats'', ''Lair'' and ''Domain''.
* Reepicheep (and the other Talking Mice) from the ''{{Narnia}}'' series, 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 {{Lampshaded}} in ''The Magician's Nephew''.
** 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 ''{{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 ''AfterManAZoologyOfTheFuture'' posits a world 50 million years hence where carnivores have gone extinct and rodents have evolved to fill the niches left by felines, canines, bears, weasels, wolverines, and so on.
* [[SherlockHolmes Doctor Watson]] makes a passing reference to the story of the giant rat of Sumatra, for which [[NoodleIncident the world is not yet prepared]].
** And Creator/FredSaberhagen picked up that dropped thread in ''The Holmes/Dracula File'', which reveals ''why'' the world was not prepared. [[spoiler: It's not its size that makes it dangerous, but the virulent plague its fleas carry.]]
** In the Series/DoctorWho[=/=]Holmes crossover ''All-Consuming Fire'', it's an alien being.
** And in Rick Boyer's ''The Giant Rat of Sumatra'', it's a [[spoiler: tapir]].
* 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...
* ''TheUnderlandChronicles'' has these as main characters- not to mention the giant insect and bats....
* Ratmen (and a genius ratgirl) play a part in Glen Cook's ''Garrett P.I.'' series. It seems the wizards of a few generations back had quite a fad for the creation of new sentient lifeforms, and they shared real-world scientists' preference for using rats as research subjects.
* Like other mammals, rodents were well-represented in the ''Spellsinger'' novels, although rats and mice were treated like second-class citizens, forced to wash floors and so on.
** It seems to be a common subversion that if rats ''aren't'' the monsters or the bad guys, they're the ButtMonkey race.
* The rats in ''Mrs. Frisby and the Rats of NIMH'' were Rodents Of Unusual ''Smarts''.
** Brutus, while certainly not giant, was described as being rather large as rats go.
** It was stated that the drugs they were given increased their size...it was part of why the normal rats feared them.
* 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...
* Lampshaded in the Russian play "The General Inspector" by Gogol. One character ''dreams'' of two "RodentsOfUnusualSize" the night before becoming a letter that said inspector is secretly coming to his town - and since he is an ObstructiveBureaucrat, it's a very bad thing indeed.
* {{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/TheBorribles'', the race of Rumbles are described as rat-like, and are the size of human children.
* In the Creator/SMStirling book, ''[[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.]]
* ''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.
* 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 ''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 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 {{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 {{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 {{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.
* ''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 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. For a little more, see another other wiki: http://wildcards.wikia.com/wiki/Ratboy
* 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 ''Death Warmed Over'', the zombie foreman of a garbage dump has giant rat pets [[AllAnimalsAreDogs that act like dogs]].
[[/folder]]

[[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 ''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}}''. [[NightmareFuel 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 ''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.
[[/folder]]

[[folder:Music]]
* The ''[[Music/WeirdAlYankovic Radioactive Hamsters From a Planet Near Mars]]''.
* Green Day had an album cover where a gigantic hamster was attacking society.
* There's a New York punk band named ''Rats of Unusual Size''.
* The WorldWarOne song "The Quartermaster's Store" mentions "rats, rats, as big as bloody cats" (see also RealLife).
* DavidBowie's "Future Legend", the first track of ''Diamond Dogs'':
-->Fleas the size of rats sucked on rats the size of cats.
[[/folder]]

[[folder:Mythology]]
* 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.
[[/folder]]

[[folder:Periodicals]]
* This is an [[http://garfield.nfshost.com/1981/09/20/ occasional]] [[http://garfield.nfshost.com/1983/12/10/ gag]] in ''{{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 ''[[PhilFoglio What's New? With Phil And Dixie]]'', Phil distracts a giant monster rat by throwing a live cat at it.
[[/folder]]

[[folder:Tabletop Games]]
* Some people in the TabletopGame/{{Warhammer}} World claim that there are such a thing as Skaven, three-foot rat-men. While it is true that [[GreenRocks Warpstone]]-mutated sewer rodents can grow to alarming size, and some specimens may walk upright and use weapons, those are merely a variety of [[BeastMan Beastmen]]. The notion that there is some sort of world-spanning "Under-Empire" of rat-men, boasting [[{{Ninja}} assassins]] or [[{{Magitek}} sorcerous engineers]] or [[MadScientist breeders of ogre-sized rat monsters]] - [[FlatEarthAtheist well, that's just patently ridiculous]].
* The underhive in ''{{Necromunda}}'' (part of the ''TabletopGame/{{Warhammer 40000}}'' setting) is infested with these. And not just any giant rats - more 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. The most "normal" foods are fungi and edible slime-molds. "Meat" in the Underhive generally comes from rats... or snakes... or spiders... or, really, anything made of meat that fails to climb out of the pot. The nastier folks are even willing to add their fellow man to the list. To say nothing of such delights as "Wild Snake", a popular booze made from a certain species of giant snake.
** The Underhive also 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.
* "Dire rats" are a common low-level monster in ''DungeonsAndDragons'' 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.
** You're forgetting rat swarms, skeletal rat swarms, corpse rat swarms (Zombies!!!), spectral swarms (incorporeal undead that typically result from careless fireball-flinging adventurers inflicting large amounts of collateral damage on the local rat population), cranium rat swarms (psychic rats!!!), moonrats (rats that become more or less intelligent depending on the phases of the moon), and the Tamer of Beasts prestige class from the book Masters of the Wild, who is depicted in the artwork as controlling a massive army of rats.
** 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 ''{{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''.
** [[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.
* 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, froming 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 (ie, 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]].
* [[{{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)
* ''TabletopGames/{{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.
[[/folder]]

[[folder:Toys]]
* ''Franchise/{{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.
[[/folder]]

[[folder:Video Games]]
* {{Pokemon}} has quite a few of these, often ComMons. Examples include Rattata, Pachirisu, and of course, the Pikachu family.
** VideoGame/SuperSmashBros has very scary implications if it weren't for the fact that the characters are trophies. Imagine, if you will, dropping a life-sized Pikachu on [[VideoGame/{{Kirby}} Pop Star]] or [[{{Pikmin}} Hocotate]]. A malicious Pikachu (or however many more) in either of those settings would be a Cthulhuesque horror upon the populations of those worlds, as it fits ALL of the ROUS criteria without the use of [[SuperMarioBros Super 'Shrooms]].
*** Somewhat justified because 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 Hyper Fang move.
* ''UltimaUnderworld II'' features giant rats of various types.
* ''BreathOfFire'' does the small player thing, but with cockroaches.
* ''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
* ''VideoGame/TheElderScrollsIIIMorrowind'' had giant rats, and in an expansion, tamed giant rats that carried extra stuff for your character.
** ''[[VideoGame/TheElderScrollsIVOblivion Oblivion]]'' had a vast array of underground catacombs and Romantic secret passages lit by torchlight. [[Literature/{{Discworld}} It was damp. There were rats.]]
*** There's also a woman in one of the cities that keeps pet rats. Her rival hated 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.
**** That's because they were starved.
** In ''[[VideoGame/TheElderScrollVSkyrim Skyrim]]'' they're called skeevers. They're so big that people lay down bear traps to catch them. One crazy guy underground tried to create an army of them.
*** At least one {{NPC}} notes that the skeevers used to be smaller.
* Twitch, a champion in ''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.
** And rat-men were another common annoyance, though they were at least one of the few enemies your city guard could handle competently.
* ''Puzzle Quest: 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.
* ''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. [[GoddamnBats Goddamn]] [[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.
* ''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 ''Earthworm Jim'', 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 ''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 TropeNamer.
* Mouser from ''[[SuperMarioBros Super Mario Bros 2]]'' 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').
* ''EverquestII'''s Ratonga are prime examples of what happens when you give a ROUS opposable thumbs and knives. An entire race of automatically Evil aligned [=ROUSes=] with a penchant for being thieves and assassins. Throw in Roekillik, their Minime counterpart race, and it seems someone at Sony [[AuthorAppeal rather likes this trope]]. There are also regular giant rats (also found in the first ''{{Everquest}}'').
* Every roleplaying game Spiderweb Software has ever made, with the exception of the original ''{{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.]]
* ProjectEden features normal sized rats that [[ShapeshifterBaggage transform]] into giant [[NightmareFuel acid spraying monstrosities]]
* Played for laughs at the start of ''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.
* The ''VideoGame/DuckTales'' video game 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!"
* 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.
* ''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 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 ''[[FluffyTheTerrible chinchillas]]''.
* ''DarkSouls'' has Plague Rats. Very predictable and easy to kill but inflict poison. They come in three sizes -- cat, dog and jeep.
* 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 ''{{Runescape}}'', especially in lower level areas
* ''{{Arcanum}}'' has rock rats and the larger granite rats.
* ''PlanescapeTorment'' includes the ''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 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...).
[[/folder]]

[[folder:Webcomics]]
* Giant mutant rodents are the signature creation of ''{{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 [[MistyTheMouse Distraction Damsel]] (though she's only really big [[MostCommonSuperpower where it counts]], [[{{Superman}} Mighty Mighty Hamster]], and of course, the [[AttackOfTheFiftyFootWhatever World's Largest Hamster]].
* ''Secretary'', the second arc of ''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 ''{{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 ''BladeOfToshubi'' we have Toshubi, a human-sized anthropomorphic mouse from a village of human-sized anthropomorphic mice.
* In ''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.
* ''CrewDogs'': Rodents of Unusual Size live in the ceiling spaces, and are known to feed on [[EnsignNewbie Second Lieutenants.]]
[[/folder]]

[[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.".
* Squirrels are one of the eight [[InsistentTerminology sentient (i.e., humanoid)]] species in {{Tasakeru}}. They're the only rodent species among sentientkind; the others are canines (wolves and foxes), mustelids (badgers, ferrets and skunks), procyonids (raccoons), and lepines (rabbits).
* [[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.
[[/folder]]

[[folder:Western Animation]]
* Splinter from ''Franchise/TeenageMutantNinjaTurtles'' is a pet rat who was mutated into a four foot rat-man.
** Or, if you refer to the [[TMNT1987 1987 series]], a human mutated into a four foot sewer rat.
** Or, if you refer to the [[WesternAnimation/TeenageMutantNinjaTurtles2012 2012 series]], a human mutated into a ''six'' foot sewer rat.
* [[ClassicDisneyShorts Mickey Mouse]] is a three foot tall mouse. Good thing he's not dangerous. [[KingdomHearts Well,]] [[EpicMickey usually]]
** RobinWilliams jokes that his son was traumatized by the actor playing Mickey Mouse at [[DisneyThemeParks Disneyland]].
* Rattrap, of ''{{Transformers}}: WesternAnimation/BeastWars'' and ''WesternAnimation/BeastMachines'', transforms into a giant rat, a choice influenced by TransformationConventions. While not the genuine article, his personality is such that he might as well be, and he certainly seems to think of himself as one.
--> Rat...robot. Rat...robot. I'm a robot ''and'' a rat! Yeah, I ''like'' it!
** The quote above was said immediately after all the Maximals had a breakthrough of sorts resulting in the merging of their Transformer and animal psyches. Just saying.
* Gorgonzola from ''{{Chowder}}''. Also, overabundance of giant rats is apparently why Mung [[IdiotBall keeps poison in the spice cabinet]].
* ''GodzillaTheSeries'' featured the titular reptile chasing down giant rats in New York City in an episode entitled "Cat and Mouse."
* ''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.
* ''ThePenguinsOfMadagascar'' features King Rat, a tall, muscle-bound mutated lab rat who occasionally leaves the sewer to make trouble for the penguins.
* ''WesternAnimation/SouthPark'' was attacked by giant carnivorous guinea pigs. The guinea pig community was quite full of {{Squee}} over it.
* ''TheTick'' had Speak, his pet capybara (see Real Life, below), much to [[{{Sidekick}} Arthur's]] dismay.
* ''WesternAnimation/ChipNDaleRescueRangers'' has a heroic example; in one episode, the Rescue Rangers (a fly and four rodents) are enlarged to human size.
* 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? [[BadAss "Bring It On!!!]]
* An episode of ''WesternAnimation/AladdinTheSeries'' featured rat people, who were only slightly shorter than Jasmine and Aladdin.
* An episode of ''{{Jimmy Two-Shoes}}'' 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.
** And of course [[WesternAnimation/TomAndJerry Jerry]] pulled the same trick on Tom, with a ''baby elephant''.
* In the LooneyTunes ''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 ''BackAtTheBarnyard'' when everyone got a clone, said clones were all mini-sized.. except Pip's, who went the other way.
* ''WesternAnimation/AlvinAndTheChipmunks'' in their animated incarnations. They're chipmunks and are never implied to be anything but chipmunks, but they're generally about four feet tall. The newer CG-animated remake has them at actual chipmunk size.
* Alcazar's friend Rat Man and his girlfriend, from ''WesternAnimation/{{Futurama}}''.
* 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.
* 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.
* 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.
* In the when-nightmares-attack episode of ''GIJoe'', Lowlight is revealed to have recurrent bad dreams about hybrid rat/car horrors stalking him at night in his father's junkyard.
* ''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."
* On an early episode of ''TheSimpsons'', Bart is [[LittleKnownFacts convinced]] by Sherri and Terri that the ''Mayflower'' left England to escape from giant rats.
* Slappy and Skippy Squirrel from ''WesternAnimation/{{Animaniacs}}'' are about as tall as a short human. In contrast, WesternAnimation/PinkyAndTheBrain are normal-sized mice.
[[/folder]]

[[folder:Real Life]]
* The [[http://en.wikipedia.org/wiki/Capybara capybara]], a South American rodent ''the size of a small pig.''
* Trench rats in World War One were often reported to grow to the size of house cats, because of their constant engorging 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 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 New Orleans, [[http://en.wikipedia.org/wiki/Coypu Coypu]] (once farmed for their fur) have established breeding populations along the city's levees and waterways, where they are sometimes mistaken for Rats Of Unusual Size. These semiaquatic mammals are actually from a different family of rodent than rats, and are ''supposed'' to be the size of tomcats.
** 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 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: ''Neochoerus pinckneyi'' is a Capybara 40% larger than its modern cousin (200-250lbs); ''Casteroidies'', 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; The largest goes to ''Josephoartigasia monesi'' which did hit 10ft long, stood 5ft tall at the shoulder and weighed over a ton (it's incisor teeth were a foot in length). 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 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..
* Cloud rats can grow quite large and are even relatively similar to the rat on the page picture.
[[/folder]]

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