Quadrupedalism or pronograde posture is a form of terrestrial locomotion in animals using four limbs or legs. An animal or machine that usually moves in a quadrupedal manner is known as a quadruped, meaning `four feet` (from the Latin quad for `four` and ped for `foot`). The majority of quadrupeds are vertebrate animals, including mammals su...
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http://en.wikipedia.org/wiki/Quadrupedalism
(from the article `human evolution`) Although we are bipedal, our pelvis is oriented like that of quadrupedal primates. The early bipedal hominins assumed erect trunk posture by bending ... ...ground-living locomotion rather than those for tree-living, the possibilities are limited. If bipedal humans are discounted, there is a single .....
Found on
http://www.britannica.com/eb/a-z/q/3
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