And no matter what their size, critters with a similar wingspan to body length ratio, like a fruitfly and a hummingbird, need the same number of flaps to finish a turn.

• 不管这些动物的体积大小如何，那些翼展和体长之比类似的动物，例如果蝇和蜂鸟，它们都需要相同次数的振翅来完成一次旋转。