From a behavioral standpoint, one of the most valuable dinosaur fossils was discovered in the Gobi Desert in 1971. It included a "Velociraptor" attacking a "Protoceratops", providing evidence that dinosaurs did indeed attack each other. Additional evidence for attacking live prey is the partially healed tail of an "Edmontosaurus", a hadrosaurid dinosaur; the tail is damaged in such a way that shows the animal was bitten by a tyrannosaur but survived. Cannibalism amongst some species of dinosaurs was confirmed by tooth marks found in Madagascar in 2003, involving the theropod "Majungasaurus".