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Animals

Some Dinosaurs May Have Reared Back and ... Cooed

Specialized sounds birds make with mouths closed may have been made by dinosaurs too.

July 12, 2016
5:07 PM EDT
An X-ray image shows a ring dove (Streptopelia risoria) producing cooing sounds with a closed mouth. Birds push air into an esophageal pouch to make the sounds. Credit: TOBIAS RIEDE