National Geographic Documentaries

Weirdest Dinosaurs

TV-PG
2015 • E27    Jun 8, 2015    45m
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.

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