Why does sound startle these caterpillars even though they don't have ears?

Tobacco hornworm caterpillars have no organs that resemble ears. Yet, scientists were able to figure out how they hear—and it could inspire next generation microphones.
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I get the best sound quality out of my Sony headphones and earbuds by changing this setting

Sony's LDAC codec enables hi-res audio on Android phones, but you need to download the Sound Connect companion app and change ...