> [!summary] Progressive Summary # Structured Notes ## Definitions ## Chapter Summaries ### Introduction Humans can only listen within a range of 20 Hz to 20 kHz. Infrasound refers to frequencies below our audible range. This includes the mating vibrations of peacocks, the sounds of elephants and whales, of the Earth's vibrations. Ultrasound refers to frequences about our audible range, and detectable by bats, mice and moths. Animals also use ultrasound in a process called echolocation or biosonar to produce scans of their environment. > As Blackfoot philosopher Leroy Little Bear says, “The human brain is like a station on the radio dial; parked in one spot, it is deaf to all the other stations … the animals, rocks, trees, simultaneously broadcasting across the whole spectrum of sentience.” **bioacoustics** - the science of listening to non-humans. It is the study of sounds made by living organisms. **ecoacoustics** (also called acoustic ecology or soundscape studes) - listening to environmental sounds generated by entire landscapes Bioacoustics and ecoacoustics give us "digitally mediated access to hidden conversations ongoing across the natural world." It's important to approach this with an ethic of deep listening as practised by many Indigenous cultures; otherwise, these technologies can easily lead us into more domination and domestication of nature. # Quotes # References