Ascended to Carnivorism
Carnivore Confusion, all animals are omnivores. Sometimes, only the evil characters eat meat; herbivores eat plants, and "good" carnivores go vegan or eat bugs/fish. Sometimes, carnivores eat meat, herbivores eat plants, and there's nothing anyone can do short of replacing their digestive system... but in the last case, one of the herbivores, a prey animal, might get upset... might get a little obsessive about the injustice... might "crack" a little. Followed by the terrifying (or hilarious) sight of a wildebeest trampling a lion to death and feasting on the corpse. This trope need not be invoked in vengeance or uprising, but does usually affect a herbivore character that is least a little insane. A subtrope of Carnivore Confusion. Contrast Vegetarian Carnivore for when a normally meat-eating animal decides to switch to a vegetarian diet.
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Anime & Manga
- In Tales of the Dark Forest, a half-crazy unicorn decides that if he eats the entire corpse of a human, he can gain human powers, including a digestive tract that can handle meat. He's right, by coincidence.
- The Sheepwolf from Kirby of the Stars.
- In Pet Shop of Horrors, a breed of rabbits go about attacking and devouring people.
- And the other species these rabbits take after, the aphid, is herbivorous as well...
- The Immortal Game: Esteem indulges in eating meat, which is anathema to most ponies.
- In Fallout: Equestria, plenty of ponies (including some protagonists) rely on meat for sustenance, as plantlife tends to be scarce in the post-apocalyptic setting and the other alternative is centuries-old pre-packaged food. Some even prefer it. Cannibalism also occurs, although it's treated as a clear atrocity.
Films — Animation
- Finding Nemo ends with the little green fish from the sharks' meeting gobbling up the Anglerfish.
- The second Happy Feet movie featured a krill who was tired of being at the bottom of the food chain and wants to "eat something that has a face".
- We're Back! A Dinosaur's Story apparantly features a Triceratops named Woog and a Parasaurolophus named Dweeb, who both for some reason actually like to eat hot dogs.
- In the Disney film The Wild, The wicked wildebeest Kazar is tired of always being hunted by predators, so he decides to to make himself the top of the food chain. By eating a lion, no less. Kazar's Lieutenant, Blag and the rest of the wildebeests, on the other hand, don't really want to become predators, but Kazar abuses and threatens them. They stand up to him at the end of the climax
- The "Rite of Spring" segment in Fantasia featured Plateosaurus (possibly omnivorous also in Real Life) and Kannemeyeria digging for clams to eat.
- Ringing Bell: The last part has Chirin turn into a demonic, flesh-eating ram upon becoming an adult.
Films — Live-Action
- And of course, don't forget the Killer Rabbit from Monty Python and the Holy Grail.
- A similarly-psychotic rabbit appears in the 2010 horror flick Primal, although it's killed before it can rack up a body count.
- In the first act of 2001: A Space Odyssey, The Monolith is sent by unseen alien Precursors to teach the ancestors of the human species to eat meat so that they can survive a drought. (While doing research for the novel, Arthur C. Clarke consulted Isaac Asimov about the biochemistry of turning herbivores into carnivores, but none of this shows up in the final story.)
- According to the Star Wars wiki page, the bovine-looking alien that was used among the other alien creatures to fight the captured Jedi in the Geonosian arena in Attack of the Clones belonged to a species of herbivores called Reeks that were often fed meat for exhibition sports and execution to make them more aggressive. Because they could not thrive on meat, captured Reeks were fed just enough plant matter to keep them healthy.
- The gorillas in Congo were forced to eat meat to make them the perfect guards for the temple.
- The creation story in Watership Down has all animal species start out as grass-eating herbivores, some of which were transformed into carnivores by Frith (God) to keep rabbits' numbers in check.
- The rhinoceros from James and the Giant Peach.
- Cryptid Hunters: Mokele-mbembe, a living genus of sauropod, has apparently evolved to be a carnivore in the 65 million years since the dinosaurs' extinction.
- The tie-in illustrated book A Natural History of Skull Island features animals that shared Kong's Death World ecosystem, including a genus of parrots that gave up on the nut-cracking and became scavengers, complete with vulture-like bald heads.
- One episode of River Monsters features a herbivorous fish from the amazon that got trasplated to Papau New Guinea, and after depleting the vegetation the way invasive species do, began supplementing its diet with flesh. This fish, the Red-Bellied Pacu, has human like teeth in a piranha like body, though its its bite is considerably more painful than that of the piranha to which it is related due to it not being designed for that particular dietary practice.
- In the "Just So" Story The Deer and the Panther Share a House, after Panther brings home the leftovers of a dead deer, Deer goes out and (with the help of an anteater) hunts down a panther for dinner.
- Traveller The New Era supplement Aliens of the Rim: Hivers and Ithklur. During a military campaign between the herbivorous K'Kree and the Ithklur, the fighting became so bitter that each side started performing atrocities on the other, including the K'Kree eating dead Ithklur bodies.
- In the Dungeons & Dragons adventure "The Curse of Xanathon", one of the screwy proclamations issued by an insane king is that horses in his kingdom should be fed nothing but meat, supposedly to make them strong. This is one of several such orders intended to weaken the kingdom in preparation for a takeover by the evil priest who caused the king's insanity.
- In Overlord I, The Corruption that has swept through the Elven forest has driven the local unicorns mad, causing them to become murderous carnivores — they're introduced ripping out the guts of dwarven corpses and gorging on the entrails.
- In D2, protagonist Laura discovers that she was cloned from the remains of a prehistoric Winged Humanoid that was found preserved in a glacier...inside the stomach of a wooly mammoth.
- Banjo-Tooie has a baby Styracosaurus with a taste for meat. This becomes Hilarious in Hindsight in that some scientists now consider ceratopsians to be omnivorous.
- Happens to a human in Pandora's Tower. The heroine, Elena, was formerly a devout Miko of a religion that prohibits the consumption of meat. Unfortunately, Elena is suffering from the Curse of the Beast, which slowly transforms her into a hideous monster and can only be temporarily quelled by eating the flesh of beasts. While meat initially makes her disgusted and nauseous, she eventually adapts to eating it over the course of the game. If the player neglects to feed her, she becomes desperate enough to start eating animals like birds.
- In Digger:
- A possible subversion; Digger the wombat is forced to do this to become an honorary member of the Hyena tribe, but is horrified by the idea. Turns out her fears were justified; she then gets very, very ill.
- The hyena tribe also has an inversion of this in one of their origin stories. In hyena mythology, hares were originally carnivores and descended to herbivorism.
- Kevin & Kell:
- Sort of happened in when a dimensional traveler who was "furrified" into a rabbit on arrival maintained her omnivorous diet. This caused some shock to the local herbivores when she killed and ate a panther that attacked her.
- And of course, Coney the Killer Rabbit, justified as she's half-wolf.
- Inverted by Bruno, a wolf who turns herbivore and even has a suitable digestive tract surgically installed. He also later gets herbivore teeth implanted after a fight with Rudy costs him his carnivore teeth.
- In Dan and Mab's Furry Adventures , the Demons Kira and Lorenda Soulstealer are voracious cannibals who eat countless other Beings — at least, in the early days of the series. They also happen to be an anthropomorphic zebra and a cow respectively.
- In Sluggy Freelance, the cast always makes sure Bun-Bun doesn't get hungry, fearing he might say "What the hell, let's give meat a try."
- In Sandra and Woo, Sid encounters Ruth, a squirrel who wasn't happy with her place on the food chain. She acquired a gun and only eats apex predators.
- Freefall has a truly surreal example: Dvorak's waffle irons. He programmed them to recharge when their batteries ran low; he never specified how.
- The Kenny Chronicles: Lagomorph Fuego accidentally eats Kenny's meat pizza, but his interior is mostly human guts so it's all good. Then he gains an addiction to meat in general.
- The Simpsons:
- In "Helter Shelter," the retirement home residents are watching a nature show about elderly animals. An elderly lion runs out of energy, whereupon the zebra turns around and takes a bite out of it.
- The Simpsons also sometimes portray koalas as savage carnivores, often gnawing on bones during panning shots of a zoo.
- Same can go for Elephants, in which they've been depicted as grabbing people to eat them whole. One exception being Stampy, who only puts them in his mouth.
"Now I've had my head in an elephant, a hippo, and a giant sloth."
- In an educational film Troy McClure tells Little Jimmy about the food chain. "If a cow ever got the chance he'd would eat you and everyone you care about!"
- In "The Scorpion's Tale", a shark consumes a tube of chemicals that turns an animal docile making it harmless. This causes a school of herring it was chasing to swarm up on it and devour it like hungry piranhas, leaving it nothing but cartilage.
- A Looney Tunes short in which Sylvester and Tweety are Snowed-In featured a mouse who hasn't eaten in so long he "forgot what food looks like." He takes one look at Sylvester and decides to have him for dinner. The same plot was reused later in a Pink Panther short.
- An unusual human variation occured in Mr Meaty in which a group of soy-centric vegetarians were supposed to eat their new employee, as part of a plan that even they didn't really understand due to their extremely confusing "circle of life" chart that made no sense what so ever.
- The Mickey Mouse short "The Worm Turns" is actually about Mickey Mouse inventing a spritzer that can cause prey animals to turn against their respective predators: A fly attacks a spider, a mouse attacks a cat, a cat attacks Pluto, and finally Pluto attacks Pete the dogcatcher.
- In the Family Guy episode "Road to the North Pole", Santa's reindeer had started eating elves and tore apart any elf that wandered near them.
- Sort of. My Little Pony: Friendship Is Magic mostly averts this with the ponies eating things like daffodil sandwiches, but they also eat eggs and honey, and drink milk, all of which are animal products. This goes a bit beyond the usual diet of real horses, but they are certainly not carnivores. note
- Most primates are primarily frugivorous, and it was a pretty convenient way of obtaining glucose in a jungle where sweet fruits are everywhere. Many primates have anatomical specializations that allow them to eat fruit, leaves, gum or insects. However, several species have developed a taste for meat as well, becoming outright omnivores, including Tarsiers (have ascended to obligate carnivory as they eat only insects, crustaceans, small vertebrates, and snakes), capuchin monkeys, baboons, chimpanzees, and humans. Chimpanzees and (especially) humans are two species noted for accelerated brain development, forcing opportunistic all-consuming omnivory because herbivorous adaptations (multiple rumination stomachs as in cows, or large appendixes and nutrient-absorbing colons as in gorillas) are slow and inefficient to supply it. For humans, specialization reached the point where babies died or suffered retardation from a purely vegetarian diet with no animal products whatsoever (this is the reason why traditionally vegetarian and "ethical" diets even necessitated consumption of dairy, milk and eggs). It was only by the age of junk food, synthetic nutrients, replicated food and grazing lifestyles that complete veganism, with no animal products whatsoever, became conceivable.
- Red deer are in the Guiness Book of World Records as "Most Bloodthirsty Ungulate." It actively devours birds, small mammals, and even other deer.
- Many herbivorous animals aren't above nibbling on sources of meat if it's available. Cattle have been documented devouring chickens for the iron in blood, and hippos will scavenge on the carcasses of other animals (their own species included). As meat is easier to digest than leaves, even an animal ill-equipped to hunt prey is unlikely to pass up fresh protein that's just lying there.
- Here are some otherwise strictly herbivorous animals that have nibbled on sources of meat if it's available:
- Hares and pikas
- Hippos (see above)
- Elephants (see below)
- Horses and mules
- Even Galapagos tortoises (see below)
- A rogue Asian elephant had killed 17 people in India. Once it was killed, DNA tests on the contents of its stomach revealed that it had consumed human flesh.
- Some industrial producers of meat feed meat animals...well...meat. Usually they are "animal byproducts" that people wouldn't eat if you paid them. Unfortunately, the inclusion of cow neural tissue in cow-feed is responsible for Bovine Spongiform Encephelopathy (BSE), AKA Mad Cow Disease. This is why we can't eat cow brains, which were traditionally consumed (and considered delicious) by many cultures (and not just ones noted for liking offal—the Midwest's fried-brain sandwich used to be made out of cow cortex).
- In evolution, animals have switched from herbivore to carnivore countless times. For example, some species of ornithischian dinosaurs probably included some meat in their diet, like the pachycephalosaurs and heterodontosaurs. There's even a new theory that freaking Triceratops ate some meat from time to time. Yikes.
- Regardless of diet, most placental mammal mothers eat the afterbirth after bearing young, to reclaim valuable protein and minerals their bodies will need to sustain nutrient-costly lactation.
- In this video a cow actively pursues and devours a live baby chick.
- According to a recent study, Galapagos Tortoises (yes, the beloved and humble Gentle Giant of reptiles) will take advantage of their relationship with Galapagos finches and eat them for protein. To do this, they rise and extend their limbs so that the finch could look for parasites to feed on, only to be crushed to death when the tortoise withdraws its limbs.
- Pigs are the only even-toed ungulates to have kept their ancestral omnivory, instead of turning into herbivory like camels or ruminats. Cetaceans, on the other hand, went from riverside small ungulate omnivores to a fully predatory group that also doesn't have much in the area of hooves. Or hindlimbs.
- Dinosaurs arose from omnivore ancestors, with adaptations for either herbivory or hypercarnivory arising later; small animals like Eoraptor gave rise to both theropods like Tyrannosaurus and sauropods like Apatosaurus.
- A special mention is due to dromaeosaurids, hypercarnivorous animals belonging to the mostly omnivorous (and with plenty of herbivorous members) maniraptorans, themselves descended from hypercarnivorous theropods.
- Herbivory didn't appear in vertebrates until large reptiles and synapsids started to take said niche, some 300 million years after the first vertebrates appeared.
- Plenty of herbivorous invertebrate taxa have a few meat-eating species among them, like carnivorous caterpillars or predatory snails. Still others eat plants for their staple diet, but (as with locusts) start chowing down on their fellow bugs without hesitation when leaves get scarce and/or they're overcrowded.
- Humans who adopt an all-meat or near all-meat diet often claim to feel stronger and more energized.