Since most langurs are tree dwellers, these often scamper high on the desert cliffs or perch on nearby rooftops.
因为绝大部分的长尾叶猴是栖在树上的，他们往往是疾走出没在沙漠悬崖上或者是栖息在附近的屋顶上。
An arched fossilized foot bone found in Ethiopia shows that human ancestors walked upright 3.2 million years ago and were no longer tree dwellers, said a study Thursday in the journal Science.
周四出版的科学杂志上的一个研究声称：从一段在埃塞俄比亚发现的足弓部化石骨骼上研究显示，人类祖先在320万年以前已不再生活在树上而是开始在地上直立行走。
These species also differ morphologically: grass dwellers are slender with long tails, tree-dwellers are stocky with long legs, twig dwellers are slender but stubby-legged.
这些物种在形态上也有所不同：呆在草上的动物体型纤细，尾巴很长；呆在树上的动物体格健壮，腿长；而呆在树枝的动物体型纤细，但腿短。
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