Squirrels are arboreal creatures.

松鼠是栖于树。

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.

袋貂结趾科中一种栖于树小型有袋，生长在澳大其毗临岛屿，有长尾和浓密皮毛，包括袋猴和飞行袋貂。