Go on location with Gastornis, a 3-metre high bird; with a 20-metre long sea creature called Basilosaurus; and the Cynodictus, a hunting bear-dog. Meet the creatures that dominated the Earth in the years that followed the death of the last dinosaur 65 million years ago until the rise of man, a mere 40,000 years ago. Find out where these beasts lived, what they ate and how they survived.