50 million years ago a hungry wolf-like creature found the sea more inviting than the land. As schools of fish swam by it put its paw in the water for the first time to snatch the meal.
For most of the dinosaur era fast vicious deadly flesh-eating predators were no larger than tigers. Then came a fiendish new strategy for survive. Dinosaurs began to grow some as big as a building.
The tranquil shores of the oceans mask an underwater world with a frightening and violent past. Very real monsters once prowled these depths then vanished leaving behind stunning proof of their existence.
Millions of years before the great dinosaurs monsters of a different sort ruled the world. Strange sailed-back creatures like these are our ancient ancestors. Skeletons hidden in our closet.
Scientists once thought koalas and kangaroos can only survive in the isolation of Australia. But recent discoveries tell a different story: bloodthirsty, saber-toothed marsupials made a stand on every continent of the world.
The study of dinosaurs is a tale of discoveries and blunders. The head that should have been a tail, the horn that was really a claw, the meat-eater's head stuck on a vegetarian's body.
The study of dinosaurs has entered a new age. Predators have now become patients. High tech medicine is extracting new clues from ancient bones and revealing the genetic secrets of dinosaur DNA.
Western North America, 65 million years ago, a world is about to come to an end. An asteroid, 6 miles wide, slams into the Earth, dust clouds block out all sunlight, thousands of species perish, the dinosaurs never recover.
