Scientists uncover how tobacco hornworm caterpillars detect wasps without ears—using microscopic hairs as natural microphones. In a silent lab, researchers tested vibrations and airborne sound, discovering the caterpillars react even when vibrations are too weak to feel. Removing the hairs killed their response, proving they’re the real “ears”—each tuned to different frequencies. This bio-inspired insight could revolutionize microphone tech, turning nature’s design into next-gen audio sensors.
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