Butler,Richard J

Institution: Division of Paleontology, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA

Research Interests: History, Fossils, Mass Extinction, Radiation, Relatives, Time, Animals, Back, Body Size, Dinosaur, Dinosaurs, Minor, Report, Stem, Tracks, Character, Characters, Fossil, Limb, Phylogeny