In the Gobi desert a new sort of dinosaur has been discovered which changed drastically from birth to age six. Using a total of 19 sets of bones, paleontologists show how Limusaurus inextricabilis ("mire lizard who could not escape") changed in big ways in the first year of its life. Researchers have shown how baby versions of this dinosaur had teeth, but that these teeth left the dinosaur within a year. But what about reptiles in our modern age that lose and grow several sets of teeth? This research has an answer for that, and other oddities, too.