亚洲树栖的灵猫，有易于缠绕的长尾巴和粗浓的黑毛。
Arboreal civet of Asia having a long prehensile tail and shaggy black hair.
关于鸟类飞行的起源，传统上提出了两种对立的假设：“地栖说”和“树栖说”。
Two opposing scenarios, the "arboreal" hypothesis and the "cursorial" hypothesis, have traditionally been put forward concerning the origins of bird flight.
最初的飞行动物是首先从树梢滑翔到地面的树栖动物吗？
Were the first flyers arboreal creatures that initially glided from tree tops to the ground?
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