Soaring birds — like osprey, eagles, falcons, even vultures — can stay aloft in the air seemingly forever, rarely flapping their wings. They glide along rising air currents in a way that has ...

Birds, by design, tend to be small, light and streamlined. Yet there are some that push the boundaries of size. Here is the avian world’s best example of an ultra-heavyweight flyer. Birds of prey are ...

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 ...

An air-filled sac within the birds' lungs is believed to increase the force the birds use to power flight muscles while soaring. Soaring birds -- like osprey, eagles, falcons, even vultures -- can ...