Caterpie, known as the "worm" Pokémon, was designed by Ken Sugimori. Satoshi Tajiri, creator of the series, took heavy inspiration from his childhood hobby of insect collection in creating the various Pokémon species. Caterpie was based on the design of a caterpillar, specifically the caterpillar of the Swallowtail butterfly. Caterpie's name is derived from the word caterpillar as well. Caterpie has green skin with a yellow underbelly, yellow spots, and large red osmeterium protruding from its forehead. Their green bodies are useful for camouflage in foliage, their eyes are patterned to scare away predators, their suction-cup feet allow them to climb any surface,and the osmeterium on their heads can project a horrid stench to repel predators.Caterpie is the smallest of all the original Pokémon, and grows in size by shedding its skin. Eventually, Caterpie evolves into Metapod, and then Butterfree. It can only ever learn two attacks, Tackle and String Shot, and is severely limited in ability until it evolves. Though, in all games following Pokémon Platinum, it became capable of also learning Snore and Bug Bite.