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Sound Tracking: Harmonics Enable Bat to Focus on Prey Despite Noise

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After an echolocating bat locks on to an insect with its sonar beam, it can keep track of its prey despite receiving a slew of echoes from other objects--leaves, vines and so on. How does it separate echoes bouncing off its target from echoes bouncing off the surrounding clutter, especially when the echoes reach the bat at the same time?

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