NGM.com: Shawn Greene, John Kondis, Paul Heltzel, Stefan Estrada, and Sabi Chawla. Strange Crocs Art: Todd Marshall. Time line Credits - Mariel Furlong, NG Staff. Art: Raúl Martín.
Sources: James Clark, George Washington University; Christopher Brochu, University of Iowa; Diego Pol, Museo Paleontológico Egidio Feruglio, Argentina.
Alan Turner, Stony Brook University; Sterling Nesbitt, American Museum of Natural History.
Animations: Lots of Robots, Inc.