It has always been a mystery as to how dolphins, porpoises, killer whales, sperm whales and other toothed whales produce an array of sounds - until now
The study revealed that the sounds produced operated at different vocal registers like the human voice.
For humans the fry register represents the lowest tones, the chest register is the normal speaking voice and the falsetto register is at a higher frequency. "But the critical difference is that in humans and other land mammals, air is used both as the propellant that makes the vocal folds vibrate and as the medium in which the sounds are propagated," he added.The researchers used sound-recording tags on sperm whales, false killer whales and bottlenose dolphins to study sound production in the wild.
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