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Alien Animals

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As You Know, mice normally can't talk on Earth.
Talos: Oh my God! Get that thing away! How'd that get in here?
Carol: Hmm... the cat? This isn't what you are afraid of, is it?
Talos: That's not a cat... that's a flerken!

There is an animal on this planet that has always looked harmless — rabbits or mice or squirrels or hamsters, it doesn't matter. One day, you will be walking your corgi dog Mr. Flufferkins along and suddenly he will look up at you and say, "Thank you, human, for this relaxing walk and all those times you have scratched my chin, but I'm afraid the Nogov 10th Brigade is coming here in five of your Earth minutes to get rid of this small blue planet and replace it with a transgalactic outlet mall. However, this is good news: you can spend your last five minutes secure in the knowledge that everyone will be getting cheaper outlets soon. Well, except the human race, of course, but these things have to be built. Goodbye." And then he disappears before your very eyes, along with every other corgi on the face of the Earth.


You have just encountered the Alien Animal. These aliens don't have green skin or rubber foreheads, they just look exactly like a specific type of animal. Maybe they make up the entire population of that animal on Earth or only part of them. Sometimes they are leaving Earth because they have knowledge about the impending End of the World and sometimes they just like watching television. Just relax and go with it.

If the alien doesn't naturally resemble an animal but has disguised itself as one through Voluntary Shapeshifting, then The Dog Is an Alien. If the alien looks like an animal but isn't on Earth posing as one, it's probably an Intelligent Gerbil. If the alien animals are a certain species of great ape, see Humanity Came From Space. Can overlap with Transplanted Aliens.



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    Anime and Manga 
  • The sentient cats Luna, Artemis and Diana from Sailor Moon, who are revealed to come from the Planet Mau. Sailor Mars' pet Crows, Phobos and Deimos, may count as well.
  • A variant in Fairy Tail. Team pets Happy and Carla are thought to be cats native to Earthland, despite being able to talk, fly, and hatch from eggs (which in a world of flying intelligent dragons, Vulcan that perve on human woman and can take-over male bodies, and Celestial Spirits in the form of mermaids, minotaurs, and crab-men; isn't that strange). It turns out they are Exceeds, a race of cat-like creatures from the parallel world of Edolas, sent to Earthland to escape a cataclysm fated to end their homeworld.
  • Bochi from Yu Gi Oh Go Rush is Manya Atachi's pet dog who turns out to be an alien from the Bow Wow Wow Cluster. Not only can he change from his dog form to his humanoid form, but he learned the Wicked Dog technique that allows him to use Puppy-Dog Eyes to weaken an opponent's defenses before attacking them.

    Asian Animation 
  • Happy Heroes:
    • Planet Xing has multiple Earth animals inhabiting it, such as Funny Animal cows, dinosaurs, and octopi.
    • One episode has Big M. hire an assassin cat from his home planet, Planet Gray, to go after Careful S. and kill him.
    • Planet Guling from Season 6 also has dinosaurs to keep with its 1 Million B.C. theme.
  • Nana Moon: Most of the Moon Haven natives are undefined humanoids, but there are a few that look like Earth animals, such as Moon Haven's bear king, Grunt the pig, a cat, and an octopus, among others.

    Comic Books 

    Comic Strips 
  • A Garfield cartoon suggests that cats are invaders attempting to subjugate humanity, and that they are responsible for certain seemingly-mindless actions of dogs and lower-class humans.
  • In one Mandrake the Magician story, Narda has a dream (Or Was It a Dream??) about finding out that cats and dogs are two warring alien species; the ones on Earth were spaceshipwrecked here, and have exploited the dumb native humans (specifically, cats the females, dogs the males) to survive in comfort without their technology.
  • In '80s Ziggy Sunday strips, the titular character's pet parrot turned out to be an advance scout for an alien invasion force. This idea since seems to have been dropped.

    Film — Live-Action 

  • There is an old British tale (there are different Scottish and English versions, probably some Irish too) about a man that comes across a funeral performed by cats on his way to home. The deceased is a cat in a crown holding a scepter (or the coffin is closed and the crown and scepter are painted over the coffin). When arriving home he tells the strange story to his wife, moment in which the house cat suddenly exclaims "The Old Tom/Tim/Pete/whatever is dead? Then I'm the King of the Cats!" and promptly runs out of the house.
  • The chupacabra that feeds on goats' blood is sometimes depicted as a hairless dog-like animal left behind on Earth by its extraterrestrial owners.

  • Animorphs:
    • Domesticated dogs are the product of Pemalites bonding their souls with wolves before they became extinct. So that counts. Sort of.
    • Not an animal example, but one of the sidestories indicates that broccoli was brought to Earth by aliens.
    • In an interview, KA implied that ants evolved from the Nesk, a hivemind race that tried to colonize Earth during the age of the dinosaurs.
  • A Spider Robinson story in the Callahan series reveals that we find cockroaches distasteful because they are the degenerate descendants of an evil alien race of overlords.
  • Cat-A-Lyst by Alan Dean Foster is another one where cats are really advanced and (mostly-)benevolent aliens.
  • Cthulhu Mythos: The Cats of Earth's Dream Lands are notable for their intelligence, grace, ability to leap across the interstellar void and their ongoing war with the Cats of Saturn.
  • A fantasy example from Discworld. Nobody on the Disc suspects that dragons come from the moon until they actually get there and find a ton of them romping around. They're still dumb animals, although slightly healthier in their native environment. Intelligent dragons are, of course, imaginary.
  • Dolphins and mice from The Hitchhiker's Guide to the Galaxy. However, dolphins are never mentioned to be aliens, but rather just much, much smarter than humans. It's white mice who are the aliens, granted they're Human Aliens in their own plane of existence.
    • In The Restaurant at the End of the Universe, we learn that Humans are in fact aliens as well, descended from telephone-disinfectors, advertising executives, and other "useless" people from the planet Golgafrincham.
    • According to the novels, it would seem that dolphins are the only native sapient life on Earth.
      • Neanderthals might count as well, or they might just be biological robotic components of the computer designed to find the Ultimate Question. In any case, they all died out after the telephone-sanitisers arrived.
  • "In the Doghouse", by Orson Scott Card and Jay A. Davis (collected in Maps in a Mirror): Dogs one day start speaking human languages and announcing that they're aliens — and nobody takes them seriously; even when they start demonstrating their advanced intelligence by solving complicated math problems and the like, everybody shrugs it off as just a cute trick.
  • The cats in the book Star Ka'at and its sequels. Earth cats were colonists from a planet of sentient cats; when Earth got in danger, the advanced alien cats went to retrieve the Earth cats.
    • Also the trope is played with when it's revealed partway through the story that some of the Earth cats have degenerated to the point where they can no longer respond to the telepathic summons, and it's implied that these degenerate cats may even now be the mere animals humans thought them to be.
  • A variation in Larry Niven's Protector: all primates, including humans, are distant descendants of a group of Pak — known to palaeontologists as Homo habilis whose spaceship crashed on Earth millions of years ago. It is speculated that the radiation from their power plants accelerated their evolution into new species. This is easily one of the largest Artistic License – Biology ever taken by Niven, who usually makes extremely hard science-fiction.

    Live-Action TV 
  • Doctor Who:
    • Cats. Possibly, it's not clear whether they came from Earth and were kept as pets elsewhere or vice versa.
    • In "Survival", the Cheetah People's minions the Kitlings look exactly like Earth cats, except that they can teleport.
    • In "The Stolen Earth", it's the BEES! Okay, not all of them, but a lot of them were and they were going home, back to the planet Melissa Majoria.
  • Resident Alien: A montage shows that cephalopods came from Harry's planet, which is why he refers to the Chinese restaurant's octopus as his cousin.

    Tabletop Games 
  • Warhammer 40,000: The Jokaero are a race almost identical to orangutans. Aside from their knowledge of technology, they're pretty much just apes, even though they were created millennia before earth apes by the Old Ones.

  • In the Tamagotchi digital pet toys, the player can raise their Tamagotchi alien to grow into breeds that resemble Earth animals (such as Pochitchi, who looks like a dog).

    Video Games 
  • Baldur's Gate: Boo, the miniature giant space hamster. At least if you take Minsc's word for it.
    • A regular space hamster (i.e. a hamster living on a spaceship) resembling Boo makes an appearance in Mass Effect 2.
    • Ordinary giant space hamsters do in fact exist in the setting (they were bred by a bunch of crazy gnomes to help power their spacefaring 'Jammers), as does miniaturisation magic, so a miniature giant space hamster could well exist. Unless Boo is an Awakened Miniature Giant Space Hamster, however, he should be just as intelligent as any hamster.
  • Cthulhu Saves the World features Ultharians, who look like Earth cats, but they are green and have black eyes and they can turn their tails into Combat Tentacles. They also like taking over the planets. Notably, Paws was tired of this lifestyle and joins Cthulhu's party. Ultharians, Paws included, also reappear in Cosmic Star Heroine as harmless, albeit still kinda rude, NPCs.
  • Milla Basset from Freedom Planet looks and behaves like an Earth dog, and used to be originally from Lord Brevon's home planet as revealed in the sequel.
  • Staryu and Starmie from Pokémon are implied to be from outer space. They're starfish with mysterious psychic powers.
    • Even more strongly implied are the Clefairy family, space fairies. Strangely, this is supposed to be the reason they react to Moon Stones— which raises interesting questions about everything else that evolves by Moon Stone (Jigglypuff, Nidoran, Skitty, Munna, etc.).
      • It's commonly theorized that the other Pokémon that evolve by Moon Stone are biologically related.
  • Przygody Reksia: The fourth game reveals that the ancestors of all the moles on Earth are actually from Kuran (which would have been known as Kreton back then). They reached Earth in a space ship that was subsequently destroyed by Reksio and Kretes when they traveled to the prehistoric era.
  • In the game Sheep you have to lead the sheep, who have become stupid in the time they were on Earth, back to their home planet.
  • Can be created in Spore; you can make creatures that look rather like real animals...or you can make Starfish Aliens.
  • Star Control 3 had the aliens as cows.
  • Some of the NPCs from Super Mario Galaxy appear to be either bunnies, penguins, bees, and orcas. Super Mario Galaxy 2 actually introduced NPCs such as hummingbirds and chimpanzees.

  • While not intelligent, foxes in Jix are, in fact, extraterrestrial. A race of aliens took a group of pre-evolved foxes from the Ambis home-world and deposited on Earth to study divergent evolution on a planetary scale. The pre-evolved foxes remaining on their original planet evolved into Ambis while the ones on Earth (of course) evolved into foxes, making the Ambis the distant cousins of foxes. (In fact, Ambis bear a striking resemblance to foxes.)

    Web Original 

    Western Animation 
  • The dinosaur-like aliens from Chip 'n Dale Rescue Rangers. They look like earthling dinosaurs only smaller and more advanced, but during the Late Jurassic Period when they arrived, they ate the dinosaurs' earthling food and became as large as them, but less intelligent.
  • In one Darkwing Duck episode ("Twin Beaks"), the hero gets help from aliens that looks exactly like Earth cows. Possibly a Shout-Out to a Fantastic Four story in which Reed hypnotized some shapeshifting aliens into mode locking themselves into cows.
  • The species of highly intelligent (and highly cuddly) cats from Futurama. They're here to enslave and kill humanity, natch.
  • There's an episode of Invader Zim with warlike alien raiders who look exactly like babies.
  • Kaeloo: In Episode 98, Stumpy comes up with the idea that all of Smileyland's sheep are aliens after an incident where they abduct him, but nobody believes him. The entire episode turns out to be All Just a Dream... until Stumpy gains a strange voice and swirling eyes when he tells Kaeloo she can play leapfrog along with him and the sheep, suggesting that the sheep really are aliens and Stumpy has been hypnotized by them.
  • Kid vs. Kat: Kat comes from a planet where everyone not only looks like cats, but their language is cat-like, and they have many of the same behavorial patterns as Earth cats. Oh, and there's a race of alien hamsters, too. They're everywhere!
  • Lilo & Stitch: The Series:
    • In the "Yapper" episode, Mertle's pet dog, Gigi, is revealed to be one of Jumba's experiments (Experiment 007), designed to look and act like a Shih-Tzu dog, annoying people with its constant yapping.
    • Downplayed by Hamsterviel who he looks rather like an Earth gerbil or hamster, but doesn't usually pose as an actual hamster or gerbil and doesn't look entirely consistent to any actual earth species of gerbil, let alone hamster. One episode has him being adopted by Mertle and put in a cage just like a hamster.
    • Played straight again with Hunkahunka, who looks exactly like a hummingbird.
  • Men in Black: It is revealed that Frank the Pug looks very much like a dog anyway underneath his disguise suit.
  • Oh Yeah! Cartoons: The short "Planet Kate" is about a girl named Kate Moon befriending a group of alien dogs who happen to be archaeologists searching for a lost city on Earth where their kind used to live.
  • The Owl House: Eda tells Luz that giraffes were originally from the Boiling Isles, but were banished to Earth for being weirdos (said the witch that later leaves her detached hand on her magic staff).
  • Polly Pocket: In "Area Fifty-None," it's revealed that at least some Earth turtles (including Shani's own pet turtle) are really space aliens.
  • On Ready Jet Go!, Sunspot is kind of a mix of a rabbit, kangaroo, and raccoon.
  • On South Park Earth is revealed to actually be a massive, millennia-old alien reality show. Apparently, every other planet only has one species—a planet of deer, a planet of Asians, etc.—and we're all just forced together so everyone can watch what happens.
  • On Teen Titans (2003), an alien is visiting Earth when its intelligent pet, which looks like a green dog, escapes. Meanwhile Beast Boy, who can turn into a green version of any animal, is impersonating a dog. Hilarity Ensues.
  • Transformers features at least a handful of them whose normal robot form is an animal. Take a look at Decepticon Ravage for instance: he transforms from a feline-esque robot to a cassette and back.