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 ...
(CN) — In a new study, researchers say soaring birds like eagles, vultures and falcons that can glide effortlessly by flapping their wings only occasionally have evolved to use their lungs to aid in ...
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