For decades, scientists have debated whether these dinosaurs could whip their tails faster than the speed of sound, creating a sonic boom. The sound of a cracking whip is actually a sonic boom.

But the luna moths tails, which spin behind them as they fly, also produce echoes that resemble wingbeats. To the bat, they either sound like a very conspicuous part of their target, or like a ...

With their massive tails and iridescent colors ... its quivering feathers emit and amplify a low-frequency sound inaudible to human ears. Depending on whether they want to attract females from ...