Research finds pack-like behavior among T. rexes in southern Utah national monument The SpectrumTyrannosaurs likely hunted in packs rather than heading out solo, scientists find The Washington PostHow a mass fossil site in southern Utah may have proved emerging theory about tyrannosaurs KSL.comMass fossil site may prove tyrannosaurs lived in packs Yahoo NewsFossils found in Utah indicate tyrannosaurs were social predators, not solitary fox13now.comView Full Coverage on Google News