Bipedalism is a form of terrestrial locomotion where a creature — known as a biped, from the Latin "bi" (two) and "ped" (foot) — moves, by either walking, running or hopping, on two feet.
It must be stressed at this point that the feet belong to the hind legs not the front ones. It's only funny if you've never had to ask!
Only humans and birds (barring a small handful, for example, the shoebill) are truly bipedal. Most other creatures can, or must, adopt a quadrupedal (four-footed) stance for locomotion. Exeptions to this rule include most insects and crustaceans because they have more than four feet, slugs whose body basically is a foot, and snakes and worms which have no feet at all.
Only humans and birds (barring a small handful, for example, the shoebill) are truly bipedal. Most other creatures can, or must, adopt a quadrupedal (four-footed) stance for locomotion. Exeptions to this rule include most insects and crustaceans because they have more than four feet, slugs whose body basically is a foot, and snakes and worms which have no feet at all.
