Three Dinosaur Species Become One Gazelle-sized dinosaurs in the genus roamed Earth between 120 million and 125 million years ago, eating plants and cracking nuts with parrotlike beaks. They represent one of the most species-rich groups of dinosaurs known today, with at least nine different psittacosaurs identified since their discovery in 1923. But their ranks may have just gotten smaller.
Aug. 13, 2013 - LiveScience.com via Yahoo! News