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Proportionately Ponderous Parasites

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And the great fleas themselves, in turn, have greater fleas to go on;
While these again have greater still, and greater still, and so on.
Augustus De Morgan

When there are monstrously large creatures roaming the country side, you can expect the things that live on them (be they parasitic or symbiotic) to also be monstrously large, the creepiest of Big Creepy-Crawlies. They may be annoyances for their host, but for humans, they can be deadly. They're often monstrous or mutated just to be able to live on such gigantic life forms.

Keep in mind that some parasites can get pretty large within human hosts (tape worms, etc.). This trope is for parasites that are larger than their normal (read: human and common animal preying) brethren due primarily to their host organism being larger.

A common feature of a Womb Level and often featured living on Kaiju.


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    Anime & Manga 

    Comic Books 
  • The Authority: In the final arc of Warren Ellis's initial run, the team is up against a beyond-huge pyramidal space entity that, as a scientist put it, created Earth as a Mordor-esque vacation home, and is not happy to find that life has developed to such a degree. Inside it, the team finds an entire civilization of parasitic lifeforms that build whole cities within the creature. These parasites later hire Lobo to get revenge on the team.
  • Immortal Hulk: This trope is weaponized when a quartet of Kaiju are infected with intestinal parasites that drive them wild with hunger. Roxxon releases them in downtown Houston in order to draw out the hulk team for an extended character assassination. It works.
  • The comic book Godzilla Legends has Godzilla, again, afflicted with a parasite. This time, it's a bird making a nest amidst its spines. The radioactivity mutated the birds into razor-beaked, multi-eyed freaks.
  • Parodied in the Italian comic book Nilus: in a strip a group of Egyptian soldiers try to approach a sleeping Goliath to capture him, but are forced to make a run for it when they're attacked by Goliath's dog-sized lices.
  • Silver Surfer: One issue of the 2016 solo has Norrin and Dawn enter the mouth of a truly enormous Space Whale. Inside they encounter its immune system, which are palm-sized sentient organisms, at war with The Plague of equal size.

    Fan Works 
  • In Pok√©dex, Deoxys turn out to be the parasites of some unknown alien creature, mutated to be able to survive on its own. Considering that said Pokemon is 5'7, not to mention being very powerful, the narrator speculates accordingly on just what its host could be like.

    Film — Live-Action 
  • Cloverfield has its main monster, Clover, beset with extremely dangerous dog-sized "flea"-like creatures living on its hide. Their bite is extremely dangerous and they're about five feet long to boot. If anything they seem to be more dangerous on a personal level than Clover, which is just wandering around in confusion; the fleas actively hunt.
  • Godzilla:
    • The Return of Godzilla started this trope in modern times possibly. Here, Godzilla is afflicted with 4 to 5ft long sea lice which are hostile to human beings. They are called Shockirus.
    • In Godzilla (2014), the Mutos' life cycle apparently involves multiple larvae infesting a Godzillasaur and pupating inside its body, similar to a Tarantula Hawk and related kinds of wasp. This gives them and Godzilla a pretty good justification for fighting beyond the fact that beating each other senseless while knocking over skyscrapers is just what kaijus do.
  • The infamous Carnictis worms from King Kong (2005) originated as internal parasites of large meat-eating dinosaurs, which adapted to survive being excreted from their host and eventually evolved into free-living predators.
  • Land of the Lost has a scene where Will Ferrell's character gets a mosquito the size of a football. It drains so much blood out of him he grows pale and passes out, squishing the mosquito.
  • Pacific Rim has some appear on screen. They look like isopods, but are the size of footballs — just larger than the deep sea isopods found on the ocean floor. Strangely, they're often considered to be fairly endearing creatures, and don't seem to pose any risk to humans.

  • The Kaiju Preservation Society: Has this is an important trope, the Kaiju here are essentially walking ecosystems with the "parasites" actually living on them in an intricate web of commensal and mutual relationships, They're the technically the top predators on the alternate Kaiju Earth doing the actual killing and food collection. Not just between the kaiju and their parasites but between the different species of parasites that live on the Kaiju. There are even a widespread species of parasites solely dedicated to helping the various species of kaiju breathe and cool their biological reactors.
  • "Poor Little Warrior": A short story by Brian Aldiss about a time-traveling big game hunter who kills a brontosaurus (sic), only to be killed by the vermin swarming off its carcass.
  • Magehunter: The titular character slays a Giant Crab while docking at Kallamehr's bay. He returns to the same spot, with the crab's carcass still there, only to be attacked by giant parasitic worms feasting on the crab, the size of large snakes.
  • The Sky People: Also has dinosaurs, transplants by Sufficiently Advanced Aliens millions of years ago, though on an alternate Venus which have lice the size of crayfish; you do NOT want to get one on you.
  • In Star Carrier, a human SEALS (the second "S" stand for "space") team boards a cruiser-sized H'rulka ship, which turns out to be a one-person fighter. They discover that the H'rulka are huge colony organisms, evolved on a gas giant. The creature itself never even notices the SEALS, as they look like ants to it, but the humans almost get attacked by the large parasites living on the alien.

    Live-Action TV 
  • In the Doctor Who episode "Kill the Moon", the characters find the abandoned Mexican mining base on the Moon and discover that the miners were all killed by Big Creepy-Crawlies. However, when the Doctor analyzes them, he concludes that they're not insects at all but merely parasites this large because they are living off the ginormous creature that's about to hatch out of the Moon.

    Myths & Religion 
  • In Hindu Mythology, Earth was made from the remains of a giant which the gods made and sacrificed to themselves. Some versions go on to state that the various parasites on his body became the creatures of the Earth.
  • In Norse Mythology, the maggots that fed on the corpse of Ymir, of whom the Earth was made, become Dwarves.

    Tabletop Games 
  • Dungeons & Dragons adventure EX1 Dungeonland. The PCs can encounter a giant dog the size of an elephant. If they search its body (e.g. after killing it) they will discover (and be attacked by) three Giant Ticks.
  • Exalted: The gigantic behemoth corpse Juggernaut plays host to enormous carrion maggots, about the size of a cart horse. These are actually of greater use to the Mask of Winters than Juggernaut itself; he plans to breed them to the point where they burst out of the corpse entirely, and then set them on devouring his enemies in the Underworld.
  • Pathfinder: Wrackworms are parasites that infest the body of the evil god Rovagug. Given that Rovagug is a horror so large that an entire planetary core had to serve as his cage, wrackworms — while insignificantly small from Rovagug's perspective — are eighty foot-long monsters entirely capable of tearing cities apart, on those occasions when they wriggle out of their host's prison and onto the planet's surface.
  • Star Fleet Battles: Captain's Log #40 is a short story titled "The Nature of the Beast". A Federation starship encounters a huge monster called a Space Manta, which is infested with giant parasites. The Manta can "fire" them at targets as if the parasites were guided missiles.

    Video Games 
  • AdventureQuest: Flees and Mytes are ticks and mites the size of the player character and, in their descriptions, are said to come from the furry back of an even bigger Canis Major called a Wild Bingo.
  • Bloodborne: Some enemies are infested with parasitic worms that are long enough to become entirely new enemies when the first one is killed. Kos, the dead Eldritch Abomination at the heart of the DLC, has parasites large enough to be equippable hunter weapons.
  • Castlevania: Symphony of the Night has Beelzebub, a gigantic corpse hanging from chains which has to be destroyed to stop the giant flies and maggots continually spawning from it.
  • Endless Legend has the Urkan Lice, roughly man-sized creatures that infest the Urkans, which are more or-less Kaiju.
  • The giant monster Sin from Final Fantasy X is covered in living scales the size of a human called Sinscales, which it can fire in large quantities at small enemies. And that's not even getting into the giant monsters that live inside it.
  • Ghouls N Ghosts has a Multi-Mook Melee made up of giant carrion feeders coming out of a giant corpse.
  • Kingdom Hearts has the Parasite Cage, boss of the Monstro level. It's significantly larger than Sora.
  • The Legend of Zelda:
  • Solatorobo has enemies around your own size found inside the Titano-Machina which are basically its immune system, though there are some ulcer-like parasites.
  • Starcraft II: Zerg buildings contain short-lived tiny (relatively speaking, they look about the size of a human) organisms that are little more than teeth, claws, and legs, that swarm the closest enemy unit on the building's death.
  • Star Renegades: The Abomination found on Prycon is infested with mites that are roughly the size of the Renegades.
  • The inside of Jormundgandling in Wandering Hamster contains cells and bacteria that are about the size of Bob (who isn't an ordinary little hamster).
  • World of Warcraft has a particularly extreme example. The planet Azeroth itself is the embryonic form of a Titan called a world soul. The Old Gods are huge parasites that feed on and corrupt dormant world souls.

    Western Animation 
  • In an episode of Catscratch where the cats thawed out a woolly mammoth from a glacier, it came with fleas big enough for Waffle to ride on like a bucking bronco.
  • An episode of Chowder centered around Shnitzel and Chowder climbing a giant to make a delivery, and they run into a swarm of giant bugs along the way. The bugs appearing around waist level and Shniztel's refusal to explain to Chowder where they came from implies the bugs were equivalent to pubic lice.

    Real Life 
  • Whale tapeworms can grow to more than 100 feet long, due to the immense length of their host's digestive tract. Likewise, some of the largest barnacles on Earth grow on the snouts and flukes of humpback whales.
  • Dinosaurs and pterosaurs are known to have been infested by giant blood-sucking fleas which were up to an inch in body length, twice the length of the largest living flea species and mammoth compared to common flea species, which are usually only two or three millimetres.