栖于树上的

Squirrels are arboreal creatures.

松鼠是栖于树上的。

Any of various small arboreal marsupials of the family Phalangeridae, of Australia and adjacent islands, having a long tail and dense woolly fur and including the cuscus and the flying phalanger.

袋貂结趾科中的一种栖于树上的小型有袋，长在澳大利亚及其毗临屿上，有长尾和浓密的皮，袋猴和飞行袋貂。