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Bipedalism is a form of terrestrial locomotion where an organism moves by means of its two rear limbs. An [[bi = two + ped = foot). Types of bipedal movement include walking, running, or hopping, on two appendages (typically legs). Relatively few modern species are habitual bipeds whose normal method of locomotion is two-legged. Within mammals, habitual bipedalism has evolved four times, with the macropods, kangaroo mice, springhare [1] and homininan apes. In the Triassic period some groups of archosaurs (a group that includes the ancestors of crocodiles) developed bipedalism; among their descendants the dinosaurs all the early forms and many later groups were habitual or exclusive bipeds; the birds descended from one group of exclusively bipedal dinosaurs. A larger number of modern species are capable of bipedal movement for a short time in exceptional circumstances. Several non-archsaurian lizard species move bipedally when running, usually to escape from threats. Many animals rear up on their hind legs while fighting. A few animals commonly stand on their hind legs, in order to reach food or to keep watch, but do not move bipedally. There are two main types of bipedal locomotion macropods, smaller birds[citation needed], and rodents move by hopping on both legs simultaneously; other groups, including apes and large birds, walk or run by moving one leg at a time.[2]
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