When Whales Walked (S01E17)

S01E01 The Trouble With Trilobites S01E02 When Did the First Flower Bloom? S01E03 The Tully Monster & Other Problematic Creatures S01E04 Stegosaurs: Tiny Brains & Thagomizers S01E05 What Colors Were Dinosaurs? S01E06 The Story of Saberteeth S01E07 That Time Oxygen Almost Killed Everything S01E08 The Biggest Thing That Ever Flew S01E09 Dimetrodon: Our Most Unlikely Ancestor S01E10 The Extinction That Never Happened S01E11 The Strange Case of the Buzzsaw Jaws S01E12 The Age of Giant Insects S01E13 History's Most Powerful Plants S01E14 How Did Dinosaurs Get So Huge? S01E15 When The Earth Was Purple S01E16 'Living Fossils' Aren't Really a Thing S01E17 When Whales Walked S01E18 An Illustrated History of Dinosaurs S01E19 A Brief History of Geologic Time S01E20 The Search for the Earliest Life S01E21 The Facts About Dinosaurs & Feathers S01E22 The Last Time the Globe Warmed S01E23 What Happened to the World's Greatest Ape? S01E24 When Giant Fungi Ruled