Hawks, eagles, and other birds of prey have been known to stay aloft for hours on end using a strategic mix of flapping and gliding. Robotic birds can do the same, except that they can't replenish their batteries by snatching a mid-flight snack. However, researchers at the University of Maryland are perfecting a set of flexible solar cell wings that could allow flying bots to stay aloft indefinitely, as long as they get a peek at the sun every so often.
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