An animal that walks on two legs; any creature with two feet as its primary mode of locomotion.
From Latin bipedis, from bi- (two) + pes (foot). The word has been used in English since the 1600s, initially in zoological and anatomical contexts.
Humans are bipeds, but so are birds, penguins, and T-rexes—bipedalism evolved independently in different animal groups because walking on two legs can be super efficient in certain environments!
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