After the Dinosaurs, Earth Got Even More Terrifying | The Wild World of the Paleogene

When the dinosaurs died, Earth didn't get any safer. For the next 43 million years, the top of the food chain was up for grabs, and almost nothing that took it could keep it. This is the Paleogene, the wild world after the dinosaurs. A one-tonne snake in the swamps of South America, a hunter the size of a polar bear, alligators living in the Arctic, a German lake that kept its dead, whales that ate other whales, and the big chill that froze Antarctica. Here's who ruled Earth after the dinosaurs, and who finally kept the crown.