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This is in stark contrast to the alleged, but now refuted "whistle" mechanism, which would have required for the vocal folds to be immobile during voice production.

Before the study, it was uncertain if swifts even had vocal folds.

This focuses on the vocal folds at the top of the airway which vibrate to create sound.

First, the tiny cartilages in the human larynx -- called the arytenoids -- that change the position of our vocal folds, have changed dramatically in whales.

In humans, our voices come from vibrations when air passes over structures called vocal folds in our throat.