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The indri is the only known species of lemur that sings. Vijay Barve via Wikimedia Commons under CC BY-4.0 Professional singers are trained to subtly change the shape of their mouths and throats to ...

Indris, the world’s only known singing lemurs, open their mouths wider as their songs reach higher pitches, according to researchers at the University of Warwick. That movement is similar to a ...