Bats use echolation – (read above) – to detect prey in the dark.  However some moths, such as the tiger moth have evolved super sensitive ears that can hear bats ultrasonic chirps. So when they hear a bat closing in on them – they can take evasive action, often resulting in a dramatic aerial acrobatic contest between predator and prey; which, more often than not, the bat would win. So moths got smarter. Instead of just taking evasive action, they emitted sound back to bat, often emitting as many as 450 clicks in 1/10th of a second. Such action effectively jams the bat’s sonar and confuses them, allowing the moth to fly another day.

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