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Caterpie (Japanese: キャタピー, Hepburn: Kyatapii) (CAT-ur-pee[1]) is a Bug-type Pokémon introduced in Generation I.
Caterpie is a worm-like Pokémon that is mainly green in color with a tan underside. Just below its head are four, tiny legs that are used only for movement. On top of its head is a red, "y-shaped" antenna, which can be used to produce an odor used in self-defense, in case something tries to hurt it.Caterpie are known for their great appetites, usually eating many leaves before creating cocoons to evolve. They use self-made silk to both produce cocoons for evolution.
As weak, soft-bodied Pokémon, Caterpie attempt to gather as much energy as possible to hasten their evolutions into Metapod, and afterwards into Butterfree. However, they are not completely defenseless and do have a few tricks up their sleeves.