Foraging bats can warn each other away from their dinners

Look into the spring sky at dusk and you may see flitting groups of bats, gobbling up insect meals in an intricately choreographed aerial dance. It's well known that echolocation calls keep the bats from hitting trees and each other. But now scientists have learned some bats emit another call: one that tells their comrades to "back off" from bugs they've claimed for themselves.

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