有一种理论认为滑行节省体力。因此研究人员用飞鼯猴——一种来自东南亚的哺乳动物，当它们滑行时会伸展出四肢，变成一张巨大的翼膜。

One theory suggests gliding saves energy. So researchers tested that idea using colugos-mammals from Southeast Asia that turn into giant skin sails when they stretch out their legs.

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但是翼膀和肢臂处翼尖黑色的白羽毛可能能够帮助赫氏近鸟逃脱肉食动物的掠捕。

But white and black limb feathers might have helped Anchiornis escape predators.

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