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 ...
Birds are profoundly important animals. As predators, pollinators, seed dispersers, scavengers and ecosystem bioengineers, the world’s 11,000 species of birds play critical roles in the food chain and ...
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