Tyrannosaurs may have hunted in packs like wolves, a new study says Apr 25, 2021, 10:58 AM facebook email A tyrannosaur's skull found two miles north of the “Rainbows and Unicorns Quarry” on February 26, 2019. BLM photo courtesy of Dr. Alan Titus New evidence suggests that Tyrannosaurus Rex hunted as a pack animal. The T. Rex remains were found in the Grand Staircase-Escalante National Monument in Utah. Scientists had previously thought that the T. Rex brain was too small for this kind of complex behaviour. Tyrannosaurs were probably social animals who hunted in packs, according to research from the University of Arkansas published this week.