Look up at the sky—what do you see? During the day, it’s a vast expanse of blue with clouds drifting by. At night, it’s a ...

The physiology of Apus apus is highly specialized, enabling essential functions, such as feeding, drinking, resting, and even mating, to occur almost entirely while airborne Remaining airborne for up ...

According to bird experts Kenn and Kimberly Kaufman, much about bird flying is dependent on the species, season, and what else the bird is doing. Songbirds that feed on insects vary in the elevation ...