The closely related swan, geese and ducks were in one aerodynamic flock, for instance, while hawks eagles, ospreys and bee eaters were in another.

• 现在他们想知道的是，蝙蝠是如何控制涡流的。考虑到昆虫的翅膀比较坚硬，而蝙蝠的翅膀非常柔韧，赫登斯特朗和他的研究小组认为，蝙蝠是通过在飞行过程中改变翅膀弯曲度来实现悬停的。