Hawk (left) and seagull (right); feathers lift up as the bird descends, creating a bionic flap in their wings (IMAGE)

American Institute of Physics

Hawk (left) and seagull (right); feathers lift up as the bird descends, creating a bionic flap in their wings

Caption

Hawk (left) and seagull (right); feathers lift up as the bird descends, creating a bionic flap in their wings.

Credit

Liming Wu, Xiaomin Liu, Yang Liu, and Guang Xi

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