indeed, the trait is so useful for arboreal life that it is used by many avian palaeontologists to decide whether newly excavated species of fossil birds lived in trees or on the ground.
的确,对于树栖生物这一特点是相当有用的,而许多鸟类古生物学家也利用这一特点来确定新挖掘出的鸟类化石是栖息在树上还是生活在地面上。