Dale Russell
Dale Russell hypothesized that the more lightly built and more common "Gorgosaurus" may have preyed on the abundant hadrosaurs of the time, while the more robust and less common "Daspletosaurus" may have specialized on the less prevalent but better-defended ceratopsids, which may have been more difficult to hunt. However, a specimen of "Daspletosaurus" (OTM 200) from the Two Medicine Formation preserves the digested remains of a juvenile hadrosaur in its gut region. The higher and broader muzzles of tyrannosaurines like "Daspletosaurus" are mechanically stronger than the lower snouts of albertosaurines like "Gorgosaurus", although tooth strengths are similar between the two groups. This may indicate a difference in feeding mechanics or diet.