所有灵长类动物都有指纹，一些栖息在树上的哺乳动物如考拉也不例外。
All primates have fingerprints, as do some tree-dwelling mammals, such as koalas.
唐纳德栖息在附近的一棵树上，嘴巴指向尖顶的方向。
Donald perches on a nearby tree and the mouth pointed in the direction of the spire.
捕食者第三个脚趾的大小是很重要的，因为，对于鸟来说，长长的第三趾可以帮助其抓紧树枝，在树上栖息。
The size of the prey's third toe is important because, among birds, long third toes are helpful for grasping branches and perching in trees.
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