CBC’s Quirks & Quarks has an interview with Dr. David Hone.  He’s a paleontologist and lecturer in Zoology at Queen Mary, University of London.  He’s been studying scarring on a Daspletosaurus skull, which was found in Alberta’s Dinosaur Provincial Park.  He and his colleague, Darren Tanke, have concluded that the wounds were caused by other Daspletosaurs.  The original paper appeared in the journal PeerJ.  Dr. Hone has a post that details the findings on his blog, Archosaur Musings.