Weird Dinosaur Species Had Teeth Only in Youth

By the time they were 3 years old, ostrich-like dinosaurs called Limusaurus inextricabilis had lost all of their pointy teeth, and lived the rest of their lives as toothless beasts, a new study finds. The finding is based on years of research, said study co-author James Clark, a professor of biology at The George Washington University in Washington, D.C. From 2001 to 2011, he and study co-author Xu Xing, a scientist at the Key Laboratory of Vertebrate Evolution and Human Origins at the Chinese A