We’ve by now all seen the news that bees are dying in huge numbers. Scientists have labeled the phenomenon Colony Collapse Disorder, or CCD. Dead bees mean less crop pollination, which means less food at higher prices. What’s causing the problem is still anyone’s guess. Now, strangely, bats in the eastern U.S. are experiencing a similar plague which biologists have dubbed White Nose Syndrome (WNS) for the white fungus that appears on their bodies at the height of infection.

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This past week we happened to cover both dolphin echolocation and facial recognition. Today comes a report on a study that may bring the two concepts a little closer together. German researchers have devised a computer algorithm which is able to identify plant species using sonar echoes, in the same way bats are able to find fruit and insects. If the technology is one day sufficiently refined, it could ultimately be used for facial recognition.

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The hummingbird is an animal that by all rights shouldn't be able to fly. Its wing movements are not at all like that of other birds. But not only can they fly, they're so good at it that they're the only species which can fly backward. They're also one of the few—but not the only—that can hover. And in the past week alone, two new studies on hovering animals have been made public. One is on bats and the others on the bluegill sunfish.

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