单词	bipedal
释义	bipedal /bʌɪˈpiːd(ə)l / adjective Zoology (Of an animal) using only two legs for walking.Some will come as a surprise, like the early small-brained bipedal hominids.... That would have laid the groundwork for the success of the archaic bipedal hominids. Eventually, the behaviorists caved in and exempted the bipedal ape from their theory of everything. Derivatives bipedalism noun ... One of the pleasures of Stanford's book is its splendidly gossipy account of recent research into the early history of hominid bipedalism. But bipedalism in birds is a highly specialized form of bipedal motion; the large tails of birds' ancestors, which in crocodilians still anchor the leg muscles, have mostly vanished in birds. Well, it is clear that bipedalism arose quite early in hominid history, even if no one can be certain, in the strictest genealogical sense, that the earliest hominid was an upright biped. bipedality /ˌbʌɪpiːˈdalɪti/ noun ... Unfortunately, determining whether bipedalism was the cause of increased velocity, or simply a behavioral by-product, is difficult, as bipedality increased with stride number. The hominid fossil record shows a very clear progression in all of the key human traits - brain size relative to body size, bipedality, dentition, the use of tools, and cultural sophistication - from the miocene primates to modern humans. Postural bipedalism, similar to that displayed by chimpanzees, could possibly have originated in arboreal or terrestrial feeding situations in wooded environments and was subsequently modified to locomotor bipedality. Rhymes beadle, credal, needle, wheedle
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