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Third mass grave site may bolster theory that tyrannosaurs were social carnivores, not loner predators April 20, 2021 / 5:46 AM / AP Utah national monuments Salt Lake City Ferocious tyrannosaur dinosaurs may not have been solitary predators as long envisioned, but more like social carnivores such as wolves, new research unveiled Monday found. Paleontologists developed the theory while studying a mass tyrannosaur death site found seven years ago in the Grand Staircase-Escalante National Monument in southern Utah, one of two monuments that the Biden administration is considering restoring to their full size after former President Trump shrank them. Using geochemical analysis of the bones and rock, a team of researchers with the University of Arkansas determined that the dinosaurs died and were buried in the same place and the fossils locations weren t the result of their washing in from multiple areas.

Bears earsUnited statesSalt lake cityJoseph sertichAlan titusDeb haalandBears ears national monumentMacalester collegeBureau of land managementDenver museum of nature scienceAlan titus bureau of land managementEscalante national monumentUniversity of arkansasGrand staircase escalante national monumentPresident trumpNorth america