This is actually a good informative and interesting documentary. You cannot hear the narration against the dinosaur growling noises. The makers need to go back and re-mix the sound.

Oh, and spoiler... T-rex goes extinct.

A pretty good survey of T-Rex history and evolution, but ruined by a music soundtrack that drowns out much of what the narrator is saying.

Nice little informative trex evolutionary update. Great and fairly up to date info. Who cares about the sound. Side note, read Steve Brusatte book, The Rise and Fall of the Dinosaurs. Great read and has a chapter on the trex evolution.