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.
Bizarre Dinosaurs 2009
Stars
Jack Horner
Paul Sereno
Gregory Erickson
Robert Bakker
Kristi Curry Rogers
Mark Norell
Phillip Manning
Peter Cullen
Jenny Kubo
