Flapping ears

  title={Flapping ears},
  author={Jayne E Yack and James H. Fullard},
  journal={Current Biology},
For nocturnal insects, predation by bats can turn a moonlight flight into a nightmare. Moths have a way of avoiding bats, however, in the form of ultrasonic hearing. Because they have 'tympanal' ears, they can hear the echolocation calls of incoming bats and take evasive action. Butterflies, which are mainly diurnal, have not been known to have ultrasonic hearing. But these images from an unusual nocturnal butterfly, the hedylid, show that these butterflies, at least, have tympanal ears. The… 
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