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 fascinated ...
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 ...
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