Eons
When Fish First Breathed Air (S02E22)
385 million years ago, a group of fish embarked on a groundbreaking journey that would mark a pivotal moment in the evolution of life, becoming the...
S02E22
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Season 2 Episodes
S02E02 - The Time Terror Birds Invaded
Eons
S02E03 - Untangling the Devil's Corkscrew
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S02E04 - The Great Snake Debate
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S02E05 - The Whole Saga of the Supercontinents
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S02E06 - From the Cambrian Explosion to the Great Dying
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S02E07 - How Sex Became a Thing
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S02E08 - The Other Explosion You Should Know About
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S02E09 - How the Turtle Got Its Shell
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S02E10 - What a Dinosaur Looks Like Under a Microscope
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S02E11 - The Most Useful Fossils in the World
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S02E12 - Inside the Dinosaur Library
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S02E13 - What Was the Ancestor of Everything?
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S02E14 - How the Squid Lost Its Shell
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S02E15 - How the Chalicothere Split In Two
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S02E16 - The Age of Reptiles in Three Acts
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S02E17 - The Weird, Watery Tale of Spinosaurus
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S02E18 - From the Fall of Dinos to the Rise of Humans
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S02E19 - That Time It Rained for Two Million Years
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S02E20 - Why Triassic Animals Were Just the Weirdest
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S02E21 - Where Did Viruses Come From?
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S02E22 - When Fish First Breathed Air
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S02E23 - How the T-Rex Lost Its Arms
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S02E24 - FAQs From Our First Year
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S02E25 - When Insects First Flew
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S02E26 - The Mystery of the Eocene’s Lethal Lake
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S02E27 - When Fish Wore Armor
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S02E28 - When Birds Had Teeth
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S02E29 - How Horses Took Over North America (Twice)
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S02E30 - How a Supervolcano Made the Cenozoic’s Coolest Fossils
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S02E31 - The Rise and Fall of the Bone-Crushing Dogs
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S02E32 - Life, Sex & Death Among the Dire Wolves
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S02E33 - When We First Walked
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S02E34 - Did Raptorex Really Exist?
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S02E35 - Can We Get DNA From Fossils?
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S02E36 - When Giant Amphibians Reigned
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S02E37 - Your Place in the Primate Family Tree
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S02E38 - The Two People We're All Related To
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S02E39 - When Rodents Rafted Across the Ocean
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S02E40 - When Birds Stopped Flying
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S02E41 - When Camels Roamed North America
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S02E42 - How Sloths Went From the Seas to the Trees
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S02E43 - When Sharks Swam the Great Plains
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S02E44 - When Apes Conquered Europe
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