If human teenagers seem terrible at times, be thankful we don't have young tyrannosaurs to deal with.

Scientists now find these adolescent predators got into serious battles with their peers, with bites at times puncturing through bone — the kinds of fights we see today in distant relatives of the dinosaurs.

Researchers investigating Jane, the prized juvenile T. rex at the Burpee Museum of Natural History in Rockford, discovered she received a serious bite that punctured her left upper jaw and snout in four places. As severe as it was, the injury wasn't life threatening and eventually healed over, although it left its mark.