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CrowdScience listener Lauren from Belgium has near-complete hearing loss in one ear, because all the sensory hair cells in her inner ear have died. This got her thinking about how complicated the human ear is and whether there are other animals with simpler ears, in particular insects. Do they even have ears? Presenter Caroline Steel hears Lauren’s call and sets off on a hunt for insect ears. She discovers that crickets have them just below their knees. In Fernando Montealegre-Zapata’s laboratory at the University of Lincoln in the UK, she serenades a cricket to test just how much of her voice it can hear. But crickets aren’t the only ones with ears. Invertebrate neurobiologist Natasha Mhatre, from Western University in Canada, explains that you can find ears almost anywhere on an insect body – from between the legs of a praying mantis to the mouthparts of a moth. So are there even simpler ears out there? Sensory biologist Joerg Albert from University College London in the UK tells Caroline how male mosquitoes use antennae to listen out for females. But they aren’t exactly simple. In fact, a mosquito probably has more sensory neurons around their antennae than you are using to hear right now. And what about the insects that can’t hear? Scientist Jayne Yack from Carleton University in Canada unveils the hidden world of vibroscapes. Caterpillars on a leaf, for example, can sense the vibrations created by peers, predators, and even airborne sounds. Which makes Caroline wonder: when does vibration sensing actually become hearing? Presenter: Caroline Steel Producer: Florian Bohr Editor: Ben Motley (Photo: Insect singing and playing the guitar in flamenco concert - stock photo Credit: Fernando Trabanco Fotografía via Getty Images)