Evidence that "Daspletosaurus" lived in social groups comes from a bonebed found in the Two Medicine Formation of Montana. The bonebed includes the remains of three "Daspletosaurus", including a large adult, a small juvenile, and another individual of intermediate size. At least five hadrosaurs are preserved at the same location. Geologic evidence indicates that the remains were not brought together by river currents but that all of the animals were buried simultaneously at the same location. The hadrosaur remains are scattered and bear many marks from tyrannosaur teeth, indicating that the "Daspletosaurus" were feeding on the hadrosaurs at the time of death. The cause of death is unknown. Currie speculates that the daspletosaurs formed a pack, although this cannot be stated with certainty. Other scientists are skeptical of the evidence for social groups in "Daspletosaurus" and other large theropods; Brian Roach and Daniel Brinkman have suggested that "Daspletosaurus" social interaction would have more closely resembled the modern Komodo dragon, where non-cooperative individuals mob carcasses, frequently attacking and even cannibalizing each other in the process.