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If dinosaurs are really like birds, why didn't they sing?

In the minds of many, the clearest pictures of dinosaurs probably come from a certain movie, but scientists are constantly revising our understanding of their appearance, their size and, with a new study, their vocalizations. A team from the University of Texas at Austin has identified the oldest-known fossil of a bird's vocal organ, which helps paint a picture about how dinosaurs transitioned from making closed-mouth coos and booms, towards the diverse birdsong their descendants sing today.
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