Some pretty tough muscles lay beneath the macaroni penguin’s (Eudyptes chrysolophus) somewhat goofy exterior. These small ...

Certain air sacs have evolved in multiple lineages of soaring birds, and it emerges that these probably function to reduce the force required from the major flight muscles as they hold the wings in ...

Hair-thin muscles embedded in the skin of their wings allow bats like this Jamaican fruit bat to change the stiffness and curvature of their wings at different points of the wing stroke. That ...