Second set of vocal chords in male koalas

Cool anatomy – marsupials are just fabulous!

Researchers have found a second set of sound-emitting folds in male koalas that are likely the source of the males’ unique, low-pitched calls. Named the velar folds, they sit proximal to the vocal folds at the base of the soft palate, marking the juncture of the nasopharynx and oropharynx. The researchers will examine female koalas to determine whether they bear the same structure, which hasn’t been seen in other mammals. Nature (free content)

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