How Horses Took Over North America (Twice) (S02E29)

S02E01 How Two Microbes Changed History S02E02 The Time Terror Birds Invaded S02E03 Untangling the Devil's Corkscrew S02E04 The Great Snake Debate S02E05 The Whole Saga of the Supercontinents S02E06 From the Cambrian Explosion to the Great Dying S02E07 How Sex Became a Thing S02E08 The Other Explosion You Should Know About S02E09 How the Turtle Got Its Shell S02E10 What a Dinosaur Looks Like Under a Microscope S02E11 The Most Useful Fossils in the World S02E12 Inside the Dinosaur Library S02E13 What Was the Ancestor of Everything? S02E14 How the Squid Lost Its Shell S02E15 How the Chalicothere Split In Two S02E16 The Age of Reptiles in Three Acts S02E17 The Weird, Watery Tale of Spinosaurus S02E18 From the Fall of Dinos to the Rise of Humans S02E19 That Time It Rained for Two Million Years S02E20 Why Triassic Animals Were Just the Weirdest S02E21 Where Did Viruses Come From? S02E22 When Fish First Breathed Air S02E23 How the T-Rex Lost Its Arms S02E24 FAQs From Our First Year S02E25 When Insects First Flew S02E26 The Mystery of the Eocene’s Lethal Lake S02E27 When Fish Wore Armor S02E28 When Birds Had Teeth S02E29 How Horses Took Over North America (Twice) S02E30 How a Supervolcano Made the Cenozoic’s Coolest Fossils S02E31 The Rise and Fall of the Bone-Crushing Dogs S02E32 Life, Sex & Death Among the Dire Wolves S02E33 When We First Walked S02E34 Did Raptorex Really Exist? S02E35 Can We Get DNA From Fossils? S02E36 When Giant Amphibians Reigned S02E37 Your Place in the Primate Family Tree S02E38 The Two People We're All Related To S02E39 When Rodents Rafted Across the Ocean S02E40 When Birds Stopped Flying S02E41 When Camels Roamed North America S02E42 How Sloths Went From the Seas to the Trees S02E43 When Sharks Swam the Great Plains S02E44 When Apes Conquered Europe S02E45 Why Megalodon (Definitely) Went Extinct