There are some plants, like the Arabidopsis plant, that emit toxins as a defense mechanism in response to the vibrations of caterpillars chewing – even when the sound is played as a recording. – WTF Fun Facts
Source: https://entomologytoday.org/2014/07/03/plants-respond-to-caterpillar-sounds-by-creating-defensive-chemicals/
WTF Fun Fact – Plants “Hear” Chewing
