Therapods like the Tyrannosaurus Rex and velociraptor have been known for their sharp, biting teeth. Now, according to the fossil record, studies are beginning to unearth evidence that over time, therapods grew longer beaks, reducing the size and number of teeth.
Fossils, such as the Limusaurus in the picture, show young therapods with teeth and adults of the same species without teeth. In addition, researchers have uncovered jaw bones of therapod descendants that show depressions of vestigial teeth.
These findings add further evidence that our colorful birds of today are descendants of the once mighty therapods. Read the complete article entitled, "How Dinosaurs Swapped Terrifying Teeth for Bird Beaks" in the New York Times.