Summary
Overview
Karen Backer, a conservation technology researcher, explores how AI and bioacoustics are revolutionizing our understanding of non-human communication. From bats and orcas to coral larvae and even plants, she reveals the hidden acoustic world that exists beyond human hearing range and demonstrates how this technology is being used to decode animal languages, restore ecosystems, and protect endangered species.
The Hidden Acoustic World Beyond Human Hearing
Backer introduces the concept that much of nature's communication occurs in ultrasound and infrasound frequencies that humans cannot perceive. She demonstrates this with recordings of bats and orcas, explaining how AI is helping scientists decode these hidden sounds and revealing that many species have complex communication systems with dialects passed down through generations, similar to human language acquisition.
- Bat ultrasound contains complex communication including advertisement calls during mating season, with translations revealing detailed social information
- Scientists have recorded millions of bat vocalizations and decoded them using AI, discovering that bats have dialects passed down generationally
- Baby bats learn to speak like human babies by listening to adults and babbling back until they master adult bat communication
- Orcas in the Salish Sea also pass down dialects from generation to generation
- Many creatures make ultrasound including moths, mice, beetles, and rats, while elephants, whales, tigers, and some birds use deep infrasound
" Pay attention. I'm a Pipistrella's Matusi bat, specifically male. My name is X. I am landing here and we share a common social identity and common communication pool. "
" Humans tend to believe that what we cannot perceive does not exist. And so we miss a lot. "
Surprising Communication in Unexpected Species
The discussion moves to reveal shocking discoveries about species previously thought to be silent or simple. Peacocks create infrasound rock concerts with their tails that influence mating decisions, turtles communicate through their shells before hatching, and coral larvae navigate miles of ocean by listening to the sounds of their home reef despite having no central nervous system.
- Peacocks make very loud infrasound with their tails that female peahens can hear and use as an important factor in mating decisions
- Baby Amazonian turtles communicate through their shells before hatching to coordinate their birth and follow mother's calls to safety
- Coral larvae, despite having no central nervous system, can hear healthy reef sounds and swim back home across miles of open ocean
- Coral larvae hear with hair-like structures on their bodies, functioning like an inside-out ear with profoundly more sensitive hearing than humans
" You can think of a coral larva a little bit like an inside-out ear, except that its sense of hearing is profoundly more sensitive than your own because they hear with their entire bodies. "
" In nature, sound is everywhere and silence is an illusion. "
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