BBC - Planet Dinosaur (2011) Part 4 Fight for Life

From the deadliest killers to the biggest and strangest beasts, Planet Dinosaur brings to life a new and terrifying world of dinosaurs. More dinosaurs have been discovered in the last two decades than the past 200 years. This series uses the latest CGI and cutting-edge research to reveal the deadly secrets of these new giants For the first time on British television, the very latest dino discoveries have been brought together and brought to life in this groundbreaking series. Featuring a cast of new dinosaurs that will feed the nation's nightmares, the next generation of children aren't going to be talking about the tyrannosaurus rex; they are about to meet far bigger, badder, more vicious characters that roamed the Earth 95 million years ago. Narrated by John Hurt.

Part 4 Fight for Life

This episode focuses on the Jurassic period, a time when the first giant killers stalked the Earth and lurked in the seas; a time when the slightest advantage meant the difference between life and death. In North America the iconic allosaurus, an ambush hunter with a lethal bite, dominated. Not even the heavily-armoured stegosaurus was safe from this killer, and incredible evidence reveals a glimpse of a vicious battle between these two giants. Life in Jurassic oceans was no easier; in 2008, a fossil was dug out of a frozen island high in the Arctic. It was a colossal marine reptile, twice as big as most ocean predators, at 15 metres long and weighing about 45 tonnes. This was Predator X. Its skull alone was nearly twice the size of a tyrannosaurus rex's, and its bite force unmatched by anything in the Jurassic seas. The balance of power between predator and prey is a fine one, as prey continually evolves different ways to avoid predators. But for the most successful and enduring predators, the battle to survive has always been tipped in their favour.

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