Alpine swifts weigh just under a quarter-pound, glide along on a nearly 22-inch wingspan—and, it turns out, sleep while airborne. For the first time, researchers have documented that the birds can stay aloft for more than six months at a crack.
Alpine swifts weigh just under a quarter-pound, glide along on a nearly 22-inch wingspan—and, it turns out, sleep while airborne. For the first time, researchers have documented that the birds can stay aloft for more than six months at a crack.
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