When the BeautyEqualsGoodness, WhatMeasureIsANonCute and EvilTwin tropes are applied to animals that are similar but not quite the same.

For example, mice are stereotyped as mischievous critters who are capable of being cute and lovable. Rats, due to being bigger and significantly less cuddly, are rarely given as much leeway. Calling someone "mousey" lacks a harsh cannotation, it just means they're quiet and easily startled; calling someone "ratty" or a "rat" implies they're dirty and disgusting. If the hero is a mouse, one of the villains or anti-heros will be a rat. One way to insult a mouse is to "mistake" him for a rat.

'''Some Examples of "Good" Animal vs "Bad" Animal:'''
* Alligators vs Crocodiles
* Ants vs Termites
* Apes vs Monkeys (though depending on the story, either can be the good or bad one)
* Bees vs Wasps
* Butterflies vs Moths
* Chimps vs Gorillas
* Coyotes vs Jackals (though coyotes live in North America and jackals live in Africa and Western Asia)
* Crickets vs Grasshoppers
* Crickets vs Locusts
* Dogs vs Wolves (though depending on the story, either can be the good or bad one)
* Dolphins vs Sharks
* Eagles vs Vultures
* Ferrets vs Weasels
* Foxes vs Coyotes
* Frogs vs Toads
* Grasshoppers vs Locusts
* Horses vs Donkeys and Mules
* [[NiceMice Mice]] vs [[YouDirtyRat Rats]]
* Mongooses vs Weasels
* Monkeys vs Baboons [[note]]A baboon is a monkey, but it's often portrayed as the unpleasant counterpart to other monkeys.[[/note]]
* Octopi vs Squid
* Otters vs Weasels
* Pigs vs Boars
* Pigs vs Warthogs
* Rabbits vs Hares
* Ravens vs Crows (though depending on the story, either can be the good or bad one)
* Sheep vs Goats
* Snails vs Slugs
* Squirrels vs Rats
* Swans vs Geese
* Whales vs Sharks
* Wolves vs Coyotes
* Wolves vs Foxes (though depending on the story, either can be the good or bad one)
* Certain breeds of dogs vs other breeds of dogs, such as Golden Retrievers or German Shepards vs Rottweilers or Pit Bulls.

However, a work need not have a direct face off to give off this vibe. Mistaking one for the other and having said animal correct you with distaste ("Oh heavens no, I'm not a ''toad'', I'm a frog!") gives off the implication that one is somehow [[FantasticRacism an inferior version of the other]].

See IAmNotWeasel if being mistaken becomes a running gag (the mistake need not actually be considered offensive to the animal, just incredibly exasperating), ElvesVersusDwarves for a magical equivalent, SlobsVersusSnobs, which is often used to justify this FantasticRacism, and AlwaysChaoticEvil if the animal's prejudices are justified. See also NiceMice and YouDirtyRat. This trope usually follows AnimalStereotypes.

The "pleasant" and "unpleasant" animals can either be related, similar, or both.

Related to GoodAnimalsEvilAnimals.

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!!Examples:

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[[folder: Anime and Manga ]]
* Purposely invoked in ''Anime/{{Pokemon}}''. TheChick of the season, May, catches a Wurmple. The DarkChick, Jessie, also manages to catch a Wurmple. Now Wurmples can either evolve into a sweet looking little butterfly (Bug/Flying) or an obnoxiously colorful moth (Bug/Poison). Guess which girl gets which? This is a subversion though, as both Pokemon are actually quite bad, arguably the former being the worst. Dustox make messes when they eat, leaving trees barren whenever they swarm into an area and scatter noxious dust as a defense mechanism. Beautifly are actually quite savage despite their appearance, being very aggressive when provoked or disturbed and attacking by stabling with their proboscis.
** Done all the time in the Pokemon games as well. Caterpies vs Weedles, Pidgeys vs Spearows, Ledybas vs Spinaraks, and Skittys vs Glameows.
[[/folder]]

[[folder:Film]]
* In the first ''StuartLittle'' movie, a bully of George's gets punched in the face when he states "You're right, he's [Stuart] not a mouse, he's a RAT."
* When [[{{Muppets}} Kermit the Frog]] is called a toad, he explains that "frogs are handsome, debonair and charming, while toads are ugly and give you warts."
* While all the good characters in ''TheGreatMouseDetective'' are mice, the Big Bad, Professor Ratigan, is a rat. [[BerserkButton Just don't call him that to his face]].
* Inverted in ''Disney/TheLionKing'': Pumbaa is a Warthog, and being called a 'pig' is his Berserk Button. Normally, you'd consider a warthog to be the Unpleasant Animal Counterpart to a pig.
* In ''Film/InglouriousBasterds'', Hans Landa muses on the differences and similarities between rats and squirrels.
* In the 2001 ''PlanetOfTheApes'' one gorilla was very offended when Mark Wahlberg's character called him a monkey.
* In the ''WesternAnimation/{{Shrek}}'' movies Donkey wants very much to be a horse.
* In ''WesternAnimation/FindingNemo'', sharks can't stand dolphins because, according to them, they're show-offs (and liked by humans).
* In ''WesternAnimation/SharkTale'', dolphins appear to be one of the few animals that sharks don't mess with (basically their equals). When a "vegetarian" Shark decides to live amongst fish, he disguises himself as a dolphin (even though dolphins also eat fish...).
* Averted in ''WesternAnimation/{{Ratatouille}}'' where rats get to be the heroes for once (though no mice appear), though considering the title is a play on words, it's rather necessary.
[[/folder]]

[[folder:Literature]]
* In ''Literature/TheBible'' goats represent evil people, whereas sheep represent the opposite.
* In the ''{{Redwall}}'' series, mice are good whilst rats are evil, and otters are good while stoats, ferrrets, weasels and martens are evil.
* In Creator/KimNewman's ''Literature/TheHoundOfTheDurbervilles'', Professor Moriarty breeds wasps, this apparently being the evil equivalent of Franchise/SherlockHolmes becoming a beekeeper.
* In Garry Kilworth's ''HouseOfTribes'', the protagonists are all mice, while one of the antagonists is a mean dirty old murderous rat.
* In ''Literature/TwentyThousandLeaguesUnderTheSea'', whales vs cachalots (called sperm whales in modern times). Nemo is adamant against killing whales for sport, but has no problem with killing cachalots -- described as "cruel, mischievous creatures".
[[/folder]]
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