Scientists Put Caterpillars in an Ultraquiet Chamber to Learn How They Hear Without Ears

The research could do more than help unlock the mystery of caterpillar hearing. It could also help make microphones better. A moment later it freezes. Tobacco hornworm caterpillars don't look like they have ears, and yet they're able to sense predators such as wasps. How does the caterpillar know a wasp is approaching?