A fossil known as the "duelling Dinosaurs" depicts predator and prey as they died in combat. A dramatic fossil, but also one that is central to a controversial debate; does it provide evidence proving the existence of a separate tyrannosaur species? it could reveal a pygmy tyrant - the Nanotyrannus. As the evidence for and against this predator is reviewed, it reveal a dinosaur like no other, brough to life in stunning CGI.
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