These Wild Lemurs Sing Just Like Opera Stars, Widening Their Mouths as They Hit the High Notes, Study Suggests
Scientists suspect this musical trait arose independently in humans and indris, which split from a common ancestor some 74 million years ago. Today, the lemurs make loud, haunting calls to communicate with one another in the dense forests of eastern Madagascar
We haven't written up this one. Smithsonian has the full story — the link below goes straight to it.