Leg
A leg is something used to support things; to hold them up. Birds and humans have two legs. Some objects, for example tables and chairs, also have legs to hold them up.
Animals normally have 2 or 4 legs (vertebrates, which are animals with a backbone), or 6, 8, or 12 (arthropods, for example insects and spiders). Centipedes and millipedes have a lot more legs, but not exactly a hundred or a thousand as their names make people who do not know them think. Humans have 2 legs, complete with feet.
"Biped" is an animal with two legs and "quadruped" is an animal with four legs.
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