The only insect known to have just one ear is the mantis, also commonly referred to as a "praying mantis". Its single ear has two eardrums and is capable of picking up ultrasonic sounds, essential in detecting the echolocation cries of the bat, one of its biggest predators.
Oddly enough, it was just a few days ago I saw this bit of trivia on the same day of the anniversary of Vincent van Gogh cutting off his ear.
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