Bipedalism is a form of ? terrestrial locomotion where an organism ? moves by means of its two rear limbs, or ? legs. An ? animal or ? machine that usually moves in a bipedal manner is known as a biped (pronounced /?ba?p?d/), meaning "two feet" (from the Latin bi for "two" and ped for "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 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.

Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.