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Monstrous Cannibalism

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"Looks like meat's back on the menu, boys!"
Uglúk after cutting off the head of another orc, The Lord of the Rings: The Two Towers

In perhaps the most graphic form of Kick the Dog, writers often display how vicious, ravenous, or just plain evil a predatory species is, by having the strong among them literally prey upon the weak. While cannibalizing outsiders or eating sentient creatures is nasty enough, doing so to members of one's own social group is indicative of betrayal as well as cruelty, suggesting an evil or Horror Hunger so indiscriminate that no one is exempt.


With non-sentient creatures, Monstrous Cannibalism conveys how voraciously hungry the predators are, and may indicate that their species as a whole is starving and desperate. For sentients, it demonstrates a ruthlessness that bodes ill for any other species they interact with: if their instincts or culture make eating their weaker fellows a standard practice, what hope might a stranger have of being spared? In either case, seeing them turn upon their own for food is often what pushes a species over the Moral Event Horizon into being monsters in the eyes of the audience, not just beasts or antagonists.

Subtrope of I'm a Humanitarian; often a supertrope to Cannibal Tribe, if the tribe eats its own as well as enemies/strangers. Compare To Serve Man, in which victims from outside one's social group are preyed upon, and No Party Like a Donner Party, in which cannibalism is an abhorrent last resort. Contrast No Zombie Cannibals and Ape Shall Never Kill Ape.


May result in a Food Chain of Evil within the group. A common way for the Monster Lord to establish its dominance over its underlings. Sometimes overlapped with Always a Bigger Fish.


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    Anime and Manga 
  • Berserk: During the Enoch Village fight, Isidro is disgusted to observe that the trolls devour their own wounded as well as humans and livestock.
  • Subverted in InuYasha. When fighting the youkai brothers Hiten and Manten, Manten is killed by the team, and Hiten pulls out and eats his brother's heart (manga only; in the anime he extracts and absorbs a globe of energy from Manten's body). While the main characters think it's hideous that he's eating his brother, he's actually absorbing his brother's powers and the Shikon Jewel Shard embedded in his brother to defeat the people who killed his brother. Hiten even says outright that he believes that eating his brother will allow them to be together even after Manten has died. Still gross, but not as depraved as this trope usually is.
  • Kyuubey from Puella Magi Madoka Magica combines this with a bizarre case of Autocannibalism when he's shown to devour his own corpse after it gets blasted by Homura and the new one appears. In this case it's half this trope and half of the Incubator's fanatical desire to prevent entropy and avoid wasting energy.
  • The titular species from Tokyo Ghoul are stated to engage in it, though attitudes vary heavily about it. Some frown on it, primarily because Ghoul flesh is stated to taste unpleasant, while others take pleasure in hunting weaker Ghouls for sport. It is noted that cannibalism is more common in the most violent Wards, partially because eating their own kind actually increases the cannibal's strength. Some cannibals even experience a mutation, and gain the rare Kakuja-type kagune. In a twist, protagonist Kaneki Ken makes other Ghouls his primary food source after the time skip in order to become more powerful. Others note the serious toll it takes on his sanity.
  • Fullmetal Alchemist: Pride devours Gluttony despite them being essentially two parts of the same being.
  • In Bleach, Hollows eventually devour each other to gain power and go up the Sorting Algorithm of Evil. Adjuchas are practically forced to do this or else they will revert back to Gillian's, but lose their personalities forever.

    Comic Books 
  • The intelligent undead of Marvel Zombies are quite open about the fact they'd like to devour one another, but are balked from doing so by the fact that zombie flesh tastes unbearably awful to them. A few stubborn ones try anyway, but have to spit out any bites they take out of a fellow-zombie.

    Fan Works 
  • In Shadowchasers Powerprimordial, Taramanda devours her underlings as a form of execution for the worst of failure, and it is hinted that this is common for the ophidia. She has Hebi-Na broken out of prison simply to kill her this way; Hebi-Na survives because she is able to share information. (Very relevant to the plot.)

    Films — Animated 
  • In How to Train Your Dragon, the gigantic Red Death dragon is introduced by devouring a small Gronckle dragon when it fails to deliver food.
  • While Moana is distracting Tamatoa, a giant crab monster, the monster offhandedly mentions eating his own grandmother and taking an entire week to do so.
  • This is what Buzz and Woody in Toy Story think the mutant toys in Sid's room do to other toys and outright call them cannibals. It turns out the other toys actually take the toys that Sid damages to repair them.
  • The Transformers: The Movie: Unicron is a mechanical planet who transforms into a humanoid robot. He devours other mechanical planets and the humanoid robots who inhabit them.

    Films — Live-Action 
  • In Reign of Fire, the gigantic male dragon pounces on and catches one of the smaller female dragons, presumably to eat. The humans who witness this conclude that the dragons must be starving.
  • In Pitch Black, when the last survivors are running to the shuttle, Alien Blood starts falling all around them from the flock of creatures above the canyon. It appears that the ravenous creatures have begun killing and eating one another in midair.
  • In the 1959 Journey to the Center of the Earth, one of the pack of Slurpasaurs is killed by Hans, and its carcass is immediately devoured by the others.
  • In The Lord of the Rings, orcs will resort to cannibalism if other meat isn't available. The Two Towers has a scene in which an orc captain executes one of his soldiers for disobedience, then declares "Looks like meat's back on the menu, boys!" as the rest of his men tuck into the corpse. (Averted in the books, where orcs are disgusted by the thought of eating orc flesh, though they have no taboos about eating humans.)
  • In the Lost in Space movie, the space spiders immediately eat any of their number who are injured. This turns out to be a Chekhov's Gun when Future!Smith (who's been mutated into a Half-Human Hybrid by being bitten by one) is eaten alive after being stabbed.
    "They eat their wounded."
  • In Galaxy Quest, when the team comes across a group of blue teletubbie-esque creatures, one of them is injured so is offered some water by its friends, until the others immediately jump it and start to eat it.
  • In Pandorum, when Bower, Manh and Nadia kill one of the Hunters, the rest of its pack show up and immediately start to devour its corpse.
  • In Jurassic World, the Indominus Rex is revealed to have had a sibling. You get no points for guessing what she did to get it out of the picture...
    Owen: What happened to the sibling?
    Claire: She ate it.
  • Mrs. Skinner from The Food of the Gods claims that her adult chickens, which hadn't grown any larger from eating the Food, were all eaten by the baby chicks that did become giants.
  • After the first dam explodes in the Syfy Channel Original Movie Dam Sharks!, an underwater shot shows several of the bull sharks reacting to blood in the water. One bumps sideways into a smaller shark, grabs it, shakes it until it goes limp, and swims off chewing on the carcass.
  • In Daybreakers, desperate vampires who can't afford the rising cost of the dwindling supply of human blood resort to feeding on their own kind or themselves. Such cannibalism accelerates their transformation into subsiders.
  • Deep Blue Sea: The super-smart sharks are said to prefer eating other sharks, presumably to remove competition. The researchers feed an unmodified tiger shark to the genetically engineered makos, which quickly proceed to tear it apart. However, at no point do the enhanced sharks target each other, making it seem more like pack competition than sheer bloodthirstiness.
  • In The Last Man on Earth, Robert keeps finding the drained corpses of vampires in his yard, as the savage ones which besiege his house have been living off the weakest of their own number.
  • In Superman Returns, after Lex Luthor swindles his step-family out of their fortune, he leaves the house for a time, leaving two little Pekinese dogs behind. Later, when he and his gang return, there is one dog licking a pile of bones that has some fur around it. Lex's girlfriend, Kitty, comments, "Weren't there two of those?"
  • The Bad Batch, set in a desert to which people are exiled for unspecified crimes, features a gang of cannibals who devour their captives one or two limbs at a time.

  • H. P. Lovecraft:
    • At the end of "The Lurking Fear", one of the odd-eyed subterranean monstrosities turns on a weaker companion and eats it. To the narrator's eyes, it looks like a routine practice.
    • In The Dream-Quest of Unknown Kadath, it's mentioned that ghouls traditionally eat their own wounded after a battle, although Pickman has been discouraging the practice.
  • Taxxons from Animorphs suffer from a Horror Hunger so extreme that they will dive down and eat anything wounded in the area, be it humans, other Taxxons, etc.; in one horrific case, a badly-maimed one started to eat itself.
    • The series Big Bad Visser Three when frustrated often kills his own men, one horrific case involved shapeshifting into the natural predator of the Yeerk species and eating them.
    • Visser Three's twin brother goes even further, grounding and eating fellow Yeerks because it allows him to survive without kandrona rays.
  • In Chess With A Dragon, the mantis-like alien race's culture incorporates cannibalism of one's rivals or inferiors, to such a degree that "gracing the table" is a standard penalty for anyone that loses badly while gambling. Two of the ones involved in the novel's conspiracy actually formed their alliance by working together to ensure another's loss at the gaming table, purely because they think the targeted player looks tastier than the others.
  • Discworld:
    • Deconstructed/subverted in Snuff. Goblins are known to eat their young, a fact repeated by the average racist (basically 99% of the Disc's population) to prove they're "evil beasts". What is not widely known is that goblins only do this when faced with famine that would guarantee the death of both mother and child, and that the mother then makes a special pot to contain the child's soul until it can be reborn, hopefully under better circumstances.
    • In Raising Steam, we see humans that see goblins as so much less than human they use them as food. What happens to them is not pretty.
    • Referenced in Unseen Academicals, in which history depicts the race of orcs as savage warriors that devoured their own dead after a battle. Whether this really happened is unclear, although Nutt's ability to revive when stabbed suggests that fallen orcs vanishing from battlefields because they got back up again may have been misinterpreted as proof they'd been eaten.
    • When junior postman Stanley tries to parley with Mr. Grylle in Going Postal, suggesting he use the post office to send a letter to his grandmother, Grylle matter-of-factly replies that he ate his grandmother. The impression conveyed is that wild banshees don't consider this unusual.
  • Zigzagged in Strata with the Shand, a race of civilized carnivorous aliens. On the one hand, going unfed for longer than a couple of days reduces them to a feral state in which they'll kill and devour other sentient beings as readily as animals, and they sometimes experience cravings specifically for Shand meat. On the other, they are a civilized people who will encourage other races to Mercy Kill them if they're starving before they can go wild, and their cannibalistic inclinations are accommodated by a voluntary dueling tradition.
  • In Beasts of Gor Tarl and his friend are being hunted in the Gorean Arctic tundra by a pack of wild sleen, tenacous hunting mammals with six legs. Tarl's friend sets a trap: a knife with a piece of meat, its hilt frozen in a large slab of ice. One of the sleen bites the meat off the knife, slicing its mouth in the process. It then tries to lick the blood off the knife, slicing its tongue further. The other sleen, smelling blood (literally), kill it and eat it.
  • In The Wheel of Time, it is often said that Trollocs "will eat anything, so long as it's meat." They prefer humans, but will eat their own if it's convenient - trollocs are very lazy. This actually works to their advantage in war, because they need no supply lines: after a battle, they just cook up their own fallen.
  • In C. S. Lewis's "The Pilgrim's Regress", John and Virtue come upon a dragon hoarding its gold. In the dragon's poem is a line like "At times like these I wish I hadn't eaten my wife." He did so not out of hunger, but out of greed and paranoia regarding the gold.
  • In C. S. Lewis' The Screwtape Letters, this is the Lampshaded fate of demons who fail and the ultimate fate of Wormwood (by his uncle Screwtape himself). A demon's natural prey is human souls; eating other demons is their way of filling in the gap and cutting out incompetents.
  • The Redwall book Rakkety Tam introduces wolverines as a new villain species. How do we know they're much worse than all the previous series' villains? Because they eat each other! And other beasties too, but of course the whole series is a little vague about that.
  • In Jurassic Park, the raptors are seen eating their own wounded, as well as raptor eggs. It's suggested, however, that this was because they were raised in captivity, and that they never did it in the wild.
  • Simon R. Green:
    • In the first Ghost Finders novel, the ravenous shark-vampires turn upon and devour their fellows every time the agents manage to injure or kill one.
    • In one of the Hawk & Fisher tales, the Lord of the Gulfs (a Transient Being embodying famine) demonstrates its power by calling up a huge crowd of ghostly figures in the last stages of starvation. At its bidding, the ghosts turn upon each other, screaming in horror at their own deeds even as they devour each others' ectoplasmic flesh and bones.
  • In The Dresden Files novel Turn Coat, the fae spiders threaten Harry on the Way to Edinburgh, so he kills one to make the others back off. As he departs, he notices the others drooling as they gather around their dead comrade; next time he passes by, there's just drained-dry fragments of exoskeleton left there.
  • The flying harpy-like creatures from the Solomon Kane story "Wings in the Night" are alleged to have eaten their own kind when drought depleted their usual prey.
  • In Foundation and Earth, Trevize is cornered by feral dogs on the deserted planet Aurora. He shoots one to try to scare the pack away, only to watch the survivors eagerly devour the dead dog's remains.
  • In The Edge Chronicles, shrykes are perfectly willing to kill and eat their own species, especially when they are young and in a blood frenzy. Mother Muleclaw III in particular devoured her own siblings as soon as she hatched, something which was noted as a good sign for a future roost-mother. This works against them when Mother Muleclaw III is killed in battle - without her leadership, the young and inexperienced shryke army disintegrates and literally eats itself.
  • In The Dinosaur Lords, Shiraa kills and eats a fellow Allosaurus after the latter bothers her for too long. Played with in that Shiraa isn't evil - she's simply hungry and acting according to her instincts.
  • In The Traitor Son Cycle, the Wild creatures have no taboo against consuming sentient beings and one of their most important post-battle rituals is eating their fallen enemies, even if they happen to be of the same species.
  • In The House on the Borderland, the Recluse kills several of the pig-things which are besieging his house, and another pig-thing promptly starts scavenging from the carcasses. Repulsed, the Recluse shoots it as well when he realizes what it's doing.
  • In Faded Steel Heat, Venable the thunder-lizard keeper insists that his guard-dinosaurs only eat fresh meat, not carrion. Their preference is so strong that, given a choice, the larger males would rather kill and eat the smaller males than munch on a carcass they didn't hunt down themselves.
  • Every kind of wildlife on Henders Island from Fragment is so ravenously-carnivorous as to do this any time one of their own kind is dead or wounded. Indeed, the native hendros' standard means of evading packs of predators is to kill or maim the largest one in the group, thus causing its fellows to break off pursuit so they can devour it.
  • C. S. Lewis and dragons again: In The Voyage of the Dawn Treader, when Eustace gets Baleful Polymorphed into a dragon after finding a dragon horde, he starts eating the remains of the real dragon before he realises what he's doing. The narrator notes that this is because dragons are dragons' favourite food.

    Live-Action TV 
  • On Primeval, the team catch a baby raptor in a shopping mall, then use it as bait to set up an ambush for an adult that's still on the loose. They expect that, being from the same pack, the adult will come to the crying hatchling's aid, but it pounces on and eats the leashed juvenile instead.
  • The Hundjager, from Grimm, are said to consume their mother from inside the womb. They have been shown to be cold, unmerciful, and relentless trackers and assassins who usually work for the Verrat.
  • In Supernatural, the Leviathan race are expressly shown to be cannibalistic to emphasize their voraciousness. For instance, the monsters' leader Dick Roman consumes one of his minions alive for losing a holy tablet to the Winchesters. He punishes another underling by making him eat himself.
  • The ending of The X-Files episode "Our Town" implies the cannibals ate their leader.
  • Stargate Atlantis: The vampiric Wraith are shown to not be averse to feeding on members of their own species. This practice increased significantly during the Wraith Civil War, since there were not enough humans to go around (the Wraith having been woken up early from their hibernation), and fellow Wraith are the only species other than humans that they're capable of feeding on.
  • In the National Geographic Channel Documentary Predator Wars a severe drought hit South Africa. Several lionesses found a leopard dragging a kill into a tree, and in desperation one of the lionesses climbed up the tree after it (lions typically avoid climbing trees due to their weight). She successfully pulled the leopard's kill out of the tree (the leopard having escaped by climbing higher than the lion could), but when she tried to get out of the tree herself, she fell and broke her back. The other lionesses ate the leopard's kill, and when the dead lioness fell out of the tree they ate her as well.
  • On Penny Dreadful, Dracula brutally lashes out at a minion who dared speak to Vanessa and thus disrupt his plans, flinging the wretch against a wall, then gives his other familiars permission to feed on their hapless fellow. They pile on ravenously and tear their former companion apart to get at every last drop of his blood.
  • Lost Tapes: it's right there in the title of one episode: "Wendigo: American Cannibal". A group of campers become lost in the mountains and a search and rescue team goes to find them. It turns out that one of the campers has begun turning into a wendigo and picks off the campers AND the rescue team one by one, and is never caught.
  • By season three of Z Nation, the zombies are becoming desperate enough to avert the No Zombie Cannibals trope. Murphy and 10K witness a rolling ball of zombies attempting to eat one another.
  • In the Sliders episode "Dinoslide", the Sliders return to the world where dinosaurs did not go extinct but were an endangered species, just to find out that all dinosaurs are now dead except for one particularly tough T-Rex who ate the other T-Rexes after they ran out of prey.

    Tabletop Games 
  • This trope applies to many evil Dungeons & Dragons races, but is a particular hallmark of sahuagin culture, in which the maxim "Meat is meat" is used to justify their preying upon everything from other races to deformed sahuagin hatchlings to their own dead. Dragon Magazine's article "The Ecology of the Flind" attributed this gnoll subrace's physical superiority and fearsome reputation to their tribes having ritually preyed upon regular gnolls for generations, ensuring only those flinds who could best an ordinary gnoll would ever breed.
  • Subverted in depictions of trolls from the Mystara D&D setting. While they readily chomp on one another whenever they're feeling peckish, their regeneration powers ensure that any troll who's nibbled upon will quickly and painlessly recover. It's implied that some man-eating trolls are actually inoffensive by nature, but simply too stupid to grasp that non-trolls they try to make friends with don't like having their arms or legs bitten off.
  • The Tachikaze clan of Cardfight Vanguard have this as their schtick. When some Tachikaze cards attack, you can sacrifice one of your other units to give them power boosts and new effects. It becomes especially apparent with the name of their clan's keyword: Engorge.
  • Vampire: The Masquerade:
    • Vampires can completely consume another vampire's blood to eat their soul and steal their power, which is one of the few ways for vampires to lower their Generation.note  This activity is so common it has its own name: diablerie. This is considered to be the sole irredeemable deed that a vampire can commit, which is also why it's extremely common on the Sabbat side of vampirism.
    • The Nosferatu clan lives in mortal terror of a "brother clan", sired by the same Antediluvian, known as the Nictuku, whose raison de etre seems to consist solely of hunting down and eating Nosferatu.
  • Vampire: The Requiem:
    • In 1st edition, once a vampire hits Blood Potency 6, they cannot sate their thirst on anything less than the blood of other vampires.
    • In 2nd edition, this still applies, but vampires can also take a Merit called Unnatural Affinity that lets them consume blood from other supernatural beings as well, and all vampires can take nourishment from "inferior blood" if they're willing to spend Willpower.
    • As in Masquerade, vampires can devour each's others souls in an act called diablerie for a power boost.
    • The vampire bloodline of the Nosferatu clan called the Noctuku are apex predators to apex predators, preying on other vampires' blood and flesh. While Noctuku are normally loners, they're known to form Cannibal Clans called clutches that systematically prey on other vampires. If their activities are ever discovered, they're hunted by vampires unironically enforcing the double standard that only humans should be hunted and killed. As you might surmise, they're a Mythology Gag/Shout-Out to the Nictuku above.
    • Another bloodline, the "En", are also cannibals... but of the megalomaniacal king variety. They gain power over a city and give free reign to their dark appetites, creating children only to feed on them later (unless their child gets the drop on them).
  • In the 2nd edition of Werewolf: The Forsaken, Primal Urge inflicts dietary restrictions based on its potency similarly to Requiem's Blood Potency. At the highest level (8-10), one of the few things that a werewolf can eat anymore is the flesh of other werewolves.
  • Games Workshop games:
    • Warhammer 40,000:
      • The Tyranids consume all lifeforms, including their own units once they're no longer needed. Hive Fleet Hydra is particularly known for this, intentionally seeking out the remnants of previous defeated Hive Fleets to consume as fuel for their infamously exceptional reproductive abilities.
      • Played straight with Chaos Space Marines, but averted with loyalist Space Marines, some chapters of which have flesh-eating or blood-drinking as part of their rites for millenia, and aren't about to explain or justify themselves (Astartes can absorb memories from what they eat) to an outsider, leading to mistaken impressions and Inquisitiorial attention.
      • Averted with the Kroot: to them, eating other sentients is their way of life, being able to modify their DNA based on their diet. They're very aware of the effect they have on other species, and like to play up this aspect to ensure they're left to their own devices.
    • Warhammer:
      • The Ogres embody this trope pretty well. Their Chaos-resistant metabolism is such that they are perpetually hungry and can eat vast quantities of food, while their society is tribal and social status is usually earned by killing and eating your superiors (often your siblings, parents or even ambitious children and grandchildren trying to usurp you). Add to this that they live in the bleak and inhospitable Mountains of Mourn, where resources of all kinds must be carefully husbanded, and in ancient times they were cursed with an angry god of gluttony and consumption called the Great Maw, and cannibalism becomes an endemic part of their lifestyle and culture.
      • The Skaven also practice this kind of cannibalism, but with them it is played up as much more to do with low viciousness, culling the weak, dark warp-driven hungers and the fact the race is constantly on the verge of starvation because it breeds so explosively. Many Orc and Goblin tribes also behave this way, though in their case it's simply a matter of pragmatism and a complete lack of sentimentality over the remains of the dead.

    Video Games 
  • Arcanum: The chapter of the manual dealing with Orcs notes that they prefer to cannibalise rather than bury their dead. It's also an accepted orcish custom for an orc mother who gives birth to triplets to present one of the newborns to the father, who eats it in celebration of his own fertility.
  • The Battle for Middle-Earth has Mordor do this to orcs. Mountain Trolls (but not Attack Trolls) can eat the human sized orcs to regain health. Orcs can also be made to kill an eat each other for experience, or sent to the Slaughterhouse and turned into resources.
  • In Bendy and the Ink Machine, Susie relies on ink from other ink beings in order to somehow stabilize her own form and make herself "more beautiful."
  • Chimera Beast has the Eaters, of which you play as one. In the final level, the regular enemies contain other Eaters which the player's Eater can eat, and the Final Boss is a much bigger Eater who's higher up on the food chain than the player's.
  • In Dragon Age, the darkspawn are known to kill and eat each other when there's nothing else available. Even though they don't actually need to eat at all.
  • In Elona, cannibalism causes one to go temporarily insane, unless one undergoes a mutation that makes them OK with eating other people. From that point on, they'll kill and eat anyone they encounter, each other included.
  • It is implied that Seekers of the Name from Fallen London will eat other humans when their Horror Hunger is out of control. Your character can do it too, if you're a Seeker.
  • In Mass Effect 3, you encounter a new type of mooks called 'Cannibal'. Its 'special move' is to eat their own kind in order to restore health, showing how much of an eldritch abomination the reapers have turned them into.
  • Monster Hunter has the Deviljho, a giant predatory dinosaur that will eat everything including other Deviljhos and even its own tail.
  • Blackwood's journal in Scratches recounts a gruesome incident of this trope that he'd witnessed in Darkest Africa.
  • StarCraft:
    • The Primal Zerg kill and eat other creatures in order to absorb their genes and become more powerful. They gain the most essence by eating one another.
    • In StarCraft I, the Defiler can eat other zerg to regain energy. This is transplanted to Infested!Kerrigan and zerg Samir Duran.

  • When the Kvrk-chk are introduced in Quentyn Quinn, Space Ranger it's stated that they devour their dead on the spot, at social gatherings it's considered common courtesy to tear off a limb as a gift to the host, and their youngest adults have to disperse far from home every thirteen years to avoid being eaten by their younger siblings. To say nothing of their attitude towards other sapient races.
  • Stated to be the case in Drowtales; drow (especially homeless lowborn) will eat each other when desperate enough, and the drow are in such dire straits by the time the comic takes place that this is fairly common. All the soft tissues usually pink on a healthy elf are purple from malnutrition; and even clan matriarchs have this.
  • High King of Kellwood Head of the Grand Kingdoms of the Alliance Demon King Samrick has eaten his own subjects on occasion in Charby the Vampirate. Certain of his subjects have a tendency to eat each other as well so when he hosts a party in his grand palace he has to stipulate that there will be no killing or eating of fellow guests along with a dress code.
  • Modest Medusa: The protagonist's mother eats her own children on a monthly basis. This is exactly as horrifying to protagonist and reader as it sounds, made worse by how their species attain sentience around the same time that the adults get "hungry".
  • Awful Hospital: The Eye Slob has demonstrated a willingness and, indeed, eagerness, to devour others of his kind, and even levels up from doing so.

    Western Animation 
  • When we are introduced to the leader of the Manotaurs in Gravity Falls, an elderly member of the tribe voluntarily sacrifices himself to him and is eaten alive.
  • Samurai Jack encounters a family in the middle of the woods. The baby seems dead set on eating his sword and they all attack Jack, fighting over it. Eventually Jack slices the mother's face off, revealing a robotic interior. The entire family collapses into infighting as they tear the plating off and reveal themselves as robots, trying to eat each other. Jack wisely backs off and leaves them to their fate.
  • In Space Ghost Coast to Coast Zorak (a giant mantis) mentions that his mom ate her dad, and he himself ate his little cousin as he mentions it during a family reunion, his uncles don't seem to have a grudge tho.

    Real Life 
  • Rodents:
    • In Australia, the decimation of rodents' natural predators in a farming community caused an explosion in the rat population. In desperation and starvation, the stronger rats preyed on weaker ones until they virtually died out.
    • Happens often on ships which are adrift. Once the resident rats have eaten all the victuals, they turn upon each other. In the end the rat population is decimated by such cannibalistic predation, with the last few hardy fighters starving when there's no more weaklings to kill or rat carcasses to scavenge.
    • Pet rats or mice are sometimes found dead and half-eaten by their companions. Usually a subversion, as such rodents will often "clean up" the remains of a companion which dies of natural causes, in an instinctive effort to prevent the carcass from attracting scavengers and insects to the communal nest.
    • And of course, squirrels are cannibals. They eat eekhoorns. note 
  • Ant colonies regularly "recycle" injured or dead colony members as food. Averted if a dying ant suffers from an infectious disease its fellows can detect by smell, in which case it's killed and dumped outside the nest to prevent sickness from spreading.
  • Older Than Dirt: There is good evidence to suggest that cannibalism happened among many dinosaur species, including the famous Tyrannosaurus rex and Velociraptor. Also, interestingly, inverted by Triassic carnivore Coelophysis; it was once thought that the tiny reptiles found in the stomach of one spectacularly preserved specimen were baby Coelophysis that the adult had cannibalized during a food shortage, but it was later discovered that they were actually small adult reptiles.
  • Crocodilians in general are often known to add their own kind to their diet. Normally, the smaller ones stick around those who are roughly their own size and avoid the larger reptiles. Often enough, however, when a bigger crocodile gets ahold of a smaller one...messy cannibalistic eating ensues.
    • Also true of predatory lizards. Young Komodo dragons, in particular, are arboreal in their habits because of this trope: climbing trees keeps them out of reach of hungry adults.
    • Most predatory fishes or carnivorous frogs probably don't even bother to recognize whether prey is of their own species before gulping it down. If it fits in their mouth, they eat it.
  • Tiny predatory mammals, like shrews and moles, have such rapid metabolic rates that they can literally die of starvation within hours or minutes if food isn't available. Therefore they don't hesitate to kill and gobble down any potential food source, even members of their own species or (in a pinch) potential mates.
  • Schools of sharks and piranhas will turn on and eat members who are wounded, resulting in a feeding frenzy.
  • Some species of sharks will kill and eat their siblings in the womb, presumably to reduce competition and ensure the strongest survive.
  • Galactic cannibalism, when a large galaxy rips a smaller one apart and absorbs itnote . Some of them still have visible the core(s) of the assimilated galaxy or galaxies..
  • Spotted hyenas normally give birth to twins, which already have teeth as newborns. This is because twins of the same sex immediately start fighting each other, with the stronger one killing and sometimes eating the weaker.
  • If multiple chickens are put in a very small space and not fed regularly enough they will sometimes rip apart and eat the weak or injured, or if two chickens fight and the loser dies it might be eaten by the other chickens.
  • Probably one of the more well-known examples are praying mantis, famous for the male to be eaten by the female after mating. This behavior is not as common as most people may thing. Most media tend to portray this as something that always happens after mating, in reality although it has been observed it only happens if there's scarcity and the female is very hungry, but it's probably one out of ten times.
  • Domestic pigs are notorious for eating many things in general, including people, so it's not uncommon for them to eat each other.
  • Male bears are notorious for hunting down cubs within their territory. Frequently, cannibalism occurs, and like many other prey animals targeted by ursines, the unfortunate youngsters are often still alive when being consumed and eaten. Bears are also close in cognitive functions to primates which adds a whole level of nightmare fuel when one realizes that the creatures almost certainly know they are harming other members of their own kind.