Toothed whales catch food in the deep using vocal fry register
https://phys.org/news/2023-03-toothed-whales-food-deep-vocal.html
Toothed #whales use distinct vocal registers for #echolocation and communication https://www.science.org/doi/10.1126/science.adc9570
#ToothedWhales, like humans, have at least three #VoiceRegisters; the vocal fry register (also known as creaky voice, which produces the lowest tones), the chest register (which is our normal speaking voice) and the falsetto register (which produces even higher frequencies).