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 ...

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.

"After gathering data from the specimens and adjusting the dimensions of their tails, we created a model and tried to replicate the [speed of sound] results from the other study." Related ...