Peter M. Galton is a British paleontologist working in the USA. He named: Aliwalia (1985), Blikanasaurus (with J. van Heerden, 1985), Bugenasaura (1995), Callovosaurus (1980), Camelotia (1985), Dracopelta (1980), Gravitholus (with W. P. Wall, 1979), Lesothosaurus (1978), Ornatotholus (with H. Sues,1983), Othnielia, (1977), Stygimoloch (with H. Sues,1983), Torvosaurus (with J.A. Jensen, 1979), Valdosaurus, (1977), and Yaverlandia, (1971). He named the dinosaur families: Blikanasauridae (with J. van Heerden, 1985), Fabrosauridae (1972), and Staurikosauridae (1977). He named the order Herrerasauria (1985). He also championed the cladistic theory that birds are modern-day dinosaurs (with R. Bakker, 1974), showed that Hypsilophodon was not arboreal (did not live in trees), that hadrosaurs did not drag their tails but used the tail as a counterbalance for the head, and that the Pachycephalosaurs butted heads like rams.