Bizarre Dinosaurs (2009)

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Synopsis: 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.
Director: Jenny Kubo
Writer: Eleanor Grant
Stars: Jack Horner, Paul Sereno, Gregory Erickson
More info: IMDB