Images of more than 10,000 bird species reveal that farther fliers tend to have lighter feathers. NationalBirdDay
From teeny hummingbirds to giant whooping cranes, roughly half of the world’s more than 10,000 bird species migrate. Longer wings and beefed-up flying muscles often help these birds crisscross vast expanses of air. But a study of nearly all bird species suggests many migrators share another unexpected flight aid: lighter-colored feathers.
as they work hard under the hot sun to fly, researchers report December 6 inIt’s known that color can help birds hide from predators by blending in, or attract mates by standing out. But color has subtler effects too, including regulating temperature by absorbing or reflecting light, says Kaspar Delhey, an ornithologist at the Max Planck Institute for Ornithology in Seewiesen, Germany.
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