Many birds drink while standing — dipping their beaks into a pond or birdbath, taking a beakful, and then tossing their heads back to swallow the water. But drinking on the wing suits swallows best. They walk awkwardly on the ground, and their long wings are cumbersome. So it’s far more efficient to grab a drink on the glide. This adaptation holds true for some other birds, too, including Common Nighthawks and swifts. Swifts have such short legs that they never land on the ground — so a sip on the wing is essential.
More info and transcript at BirdNote.org.
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