Even this distinction is not completely clear-cut — for example, humans other than infants normally walk and run in biped fashion, but almost all can crawl on hands and knees when necessary.
There are even reports of humans who normally walk on all fours with their feet but not their knees on the ground, but these cases are a result of conditions such as Uner Tan syndrome — very rare genetic neurological disorders rather than normal behavior.
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Even if one ignores exceptions caused by some kind of injury or illness, there are many unclear cases, including the fact that "normal" humans can crawl on hands and knees.
This article therefore avoids the terms "facultative" and "obligate", and focuses on the range of styles of locomotion normally used by various groups of animals.
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The government is working to improve child protection, for instance by ensuring that cases can be dealt with more quickly.
Several lizard species move bipedally when running, usually to escape from threats.
Many primate and bear species will adopt a bipedal gait in order to reach food or explore their environment.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 intermittently or briefly use a bipedal gait.Zoologists often label behaviors, including bipedalism, as "facultative" (i.e.optional) or "obligate" (the animal has no reasonable alternative).Few modern species are habitual bipeds whose normal method of locomotion is two-legged.