Eyespot caterpillar the inspiration for a Pokémon characterPapilio troilus looks like the work of a cartoon animator, but instead this species was actually the inspiration for a character called Caterpie from the cartoon Pokémon. Apparently, insects were used heavily as inspiration for Pokémon species.
|Pokémon characters inspired by swallowtail butterflies. Left to right: Caterpie, Butterfree, and Metapod.|
|Late instar Papilio troilus in a leaf shelter [Photo: Wikipedia.org]|
Yet, various websites [wrongly] cite other Swallowtail species as the inspiration. For example, the current Wikipedia page lists Papilio cresphontes as the species on which Caterpie is based, but P. cresphontes isn't green during any of it's larval stages and doesn't even have eyespots (#TaxonomyFail)! Papilio glaucus is cited as the model here, which is a closer guess (at least this species is green with eyespots), but this is also wrong because P. glaucus lacks the yellow underbelly (instead it is a lighter green than the dorsal side).
|Final instar Papilio thaos caterpillar which looks nearly identical to Papilio cresphontes which has been wrongly cited as the inspiration for Caterpie.|
|Final instar Papilio canadensis caterpillar with the osemeterium (a defensive organ) extended. P. canadensis was considered a sub-species of P. glaucus until recently and both have very similar-looking caterpillars.|
I have always thought the little downward-slanting markings within the eyespots of some Papilio caterpillars (including Papilio canadensis pictured above) looked like the classic cartoon "eyebrows" used to indicate a character's anger (e.g. the Angry Birds logo). In fact, a similar technique has been used with Caterpie when the character is launching it's "String Shot" attack.
|Caterpie launching the String Shot attack. Note the angry eyebrows. [Image from Bulbapedia.net]|