怪异恐龙目录

由Jack Horner Paul Sereno Gregory Erickson Lawrence Witmer Robert Bakker Kristi Curry Rogers Mark Norell Phillip Manning等主演的《怪异恐龙目录》是一部纪录片。　　As dinosaurs grew into the behemoths of the Cretaceous period they evolved many extraordinary but apparently useless features including spikes, sails horns, crests and the tiny arms of tyrannosaurs. The program reviews these unusual features and discusses theories of why they exist.