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Facultative biped
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Facultative biped : ウィキペディア英語版
Facultative biped

A facultative biped is an animal that is capable of walking or running on two legs, often for only a limited period, in spite of normally walking or running on four limbs or more. Well-known examples include many lizards such as the Basilisk lizard, and even some cockroaches when running at top speed. Low-speed facultative bipedality is less common; the gibbon, a primate with an anatomy highly specialized for arboreal locomotion, can walk bipedally in trees or on the ground with their arms raised for balance.
In order to be considered a true facultative biped, an animal must be capable of sustained movement over many strides while bipedal—simply adopting a static bipedal posture while resting or looking around is not sufficient.
==Species==
Facultative bipedality is most common in lizards, but also occurs in primates, bears, insects, crabs and even octopuses. It is commonly suggested that many extinct basal archosaurs were facultative bipeds, as well as hadrosaurs.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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