Bipedalism is a form of terrestrial locomotion where an organism moves by means of its two rear limbs or legs. Types of bipedal movement include walking , running , or hopping. Few modern species are habitual bipeds whose normal method of locomotion is two-legged. Within mammals , habitual bipedalism has evolved multiple times, with the macropods , kangaroo rats and mice , springhare ,  hopping mice , pangolins and hominin apes australopithecines and humans as well as various other extinct groups evolving the trait independently. In the Triassic period some groups of archosaurs a group that includes crocodiles and dinosaurs developed bipedalism; among the dinosaurs , all the early forms and many later groups were habitual or exclusive bipeds; the birds are members of a clade of exclusively bipedal dinosaurs, the Theropods.
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