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Why are Pikachu's hind legs different?

Pikachu's legs have their own uses, so they are different. It is an electric mouse, with yellow hair all over, two brown stripes on its back, a serrated lightning tail, and brown hair on the part connected with its body.

It has a small mouth, black eyes, a red electric bag on its cheek and a black tip on its long ears. Its front paws are short and thick, with five toes, and its rear paws have only three toes. The more powerful current Pikachu can generate, the softer and more malleable the bags under the eyes on the cheeks.