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。
They sit cross legged, in concentric circles... like growth rings in a tree.
他们交叉着腿坐成一个个同心圆…就像树上的年轮。
Imagine the ancestors of birds as small, scaly, four-legged reptiles living in forest canopies, leaping from tree to tree.
鸟类的祖先很可能是一种具鳞的小型四足爬行动物，生活在森林的树冠上，经常从一棵树跳到另一棵树上。
Imagine the ancestors of birds as small, scaly, four-legged reptiles living in forest canopies, leaping from tree to tree.
鸟类的祖先很可能是一种具鳞的小型四足爬行动物，生活在森林的树冠上，经常从一棵树跳到另一棵树上。
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