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When Sharks Swam the Great Plains

If you’ve ever been to, or lived in, or even flown over the central swath of North America, then you’ve seen the remnants of what was a uniquely fascinating environment. Scientists call it the Western Interior Seaway, and at its greatest extent, it ran from the Caribbean Sea to the Canadian Arctic.
Season 2 Episode 5 Length 11:45 Premiere: 01/16/19

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Season 2 Episodes

Were These Monsters Inspired by Fossils? (ASL)
S2 E59 Length 12:18 Premiere Date 10/29/19

When Giant Lemurs Ruled Madagascar (ASL)
S2 E58 Length 10:09 Premiere Date 09/25/19

When We Took Over the World
S2 E57 Length 11:47 Premiere Date 05/14/19

The Ghostly Origins of the Big Cats
S2 E56 Length 07:32 Premiere Date 05/31/19

When Penguins Went From The Sky To The Sea
S2 E55 Length 10:33 Premiere Date 03/26/20

When the Sahara Was Green
S2 E54 Length 07:50 Premiere Date 03/26/20

How a Hot Planet Created the World's Biggest Snake
S2 E53 Length 07:45 Premiere Date 03/09/20

When the Rainforests Collapsed
S2 E52 Length 07:40 Premiere Date 02/21/20

A Short Tale About Diplodocus' Long Neck
S2 E51 Length 09:18 Premiere Date 02/21/20

How South America Made the Marsupials
S2 E50 Length 09:51 Premiere Date 02/20/20

The Giant Dinosaur That Was Missing a Body
S2 E49 Length 12:00 Premiere Date 01/30/20

The Neanderthals That Taught Us About Humanity
S2 E48 Length 09:09 Premiere Date 01/23/20

That Time the Mediterranean Sea Disappeared
S2 E47 Length 11:10 Premiere Date 01/21/20

The Fuzzy Origins of the Giant Panda
S2 E46 Length 08:20 Premiere Date 12/19/19

The Forgotten Story of the Beardogs
S2 E45 Length 09:37 Premiere Date 12/19/19

Why Male Mammoths Lost the Game (w/ TierZoo!)
S2 E44 Length 11:02 Premiere Date 12/19/19

When Giant Hypercarnivores Prowled Africa
S2 E43 Length 09:17 Premiere Date 12/19/19

How We Domesticated Cats (Twice)
S2 E42 Length 07:47 Premiere Date 11/08/19

Were These Monsters Inspired by Fossils?
S2 E41 Length 12:18 Premiere Date 11/06/19

When Hobbits Were Real
S2 E40 Length 09:10 Premiere Date 11/06/19

The Case of the Dinosaur Egg Thief
S2 E39 Length 07:28 Premiere Date 11/06/19

When Antarctica Was Green
S2 E38 Length 11:03 Premiere Date 11/06/19

When Giant Lemurs Ruled Madagascar
S2 E37 Length 10:09 Premiere Date 11/06/19

How Pterosaurs Got Their Wings
S2 E36 Length 08:33 Premiere Date 11/06/19

When Bats Took Flight
S2 E35 Length 11:09 Premiere Date 10/24/19

The Raptor That Made Us Rethink Dinosaurs
S2 E34 Length 08:35 Premiere Date 10/24/19

The Missing Link That Wasn’t
S2 E33 Length 09:54 Premiere Date 10/24/19

Was This Dinosaur a Cannibal?
S2 E32 Length 10:37 Premiere Date 10/24/19

When Giant Deer Roamed Eurasia
S2 E31 Length 06:53 Premiere Date 08/13/19

How Earth's First, Unkillable Animals Saved the World
S2 E30 Length 10:12 Premiere Date 08/11/19

How Volcanoes Froze the Earth...Twice
S2 E29 Length 10:29 Premiere Date 08/11/19

When We Met Other Human Species
S2 E28 Length 12:56 Premiere Date 08/11/19

When Ichthyosaurs Led a Revolution in the Seas
S2 E27 Length 09:38 Premiere Date 06/25/19

When the Synapsids Struck Back
S2 E26 Length 10:10 Premiere Date 06/19/19

How Evolution Works (And How We Figured It Out)
S2 E25 Length 12:09 Premiere Date 06/13/19

The Hellacious Lives of the "Hell Pigs"
S2 E24 Length 07:17 Premiere Date 06/13/19

The History of Climate Cycles (and the Woolly Rhino)
S2 E23 Length 13:14 Premiere Date 06/03/19

The Croc That Ran on Hooves
S2 E22 Length 08:41 Premiere Date 05/01/19

The Mystery Behind the Biggest Bears of All Time
S2 E19 Length 10:41 Premiere Date 04/25/19

When We Tamed Fire
S2 E18 Length 11:46 Premiere Date 04/25/19

When Giant Scorpions Swarmed the Seas
S2 E17 Length 11:38 Premiere Date 04/04/19

When We First Made Tools
S2 E16 Length 09:08 Premiere Date 04/01/19

The Giant Bird That Got Lost in Time
S2 E15 Length 08:33 Premiere Date 03/12/19

The Island of Huge Hamsters and Giant Owls
S2 E14 Length 11:41 Premiere Date 03/12/19

How 7,000 Years of Epic Floods Changed the World
S2 E13 Length 09:28 Premiere Date 03/01/19

The Evolution of the Heart (A Love Story)
S2 E12 Length 09:00 Premiere Date 02/14/19

The Island of Shrinking Mammoths
S2 E11 Length 11:20 Premiere Date 02/11/19

The Humans That Lived Before Us
S2 E10 Length 11:52 Premiere Date 02/08/19

How Blood Evolved (Many Times)
S2 E9 Length 09:56 Premiere Date 01/18/19

When Humans Were Prey
S2 E8 Length 09:21 Premiere Date 01/16/19

Why Megalodon (Definitely) Went Extinct
S2 E7 Length 10:45 Premiere Date 01/16/19

When Apes Conquered Europe
S2 E6 Length 08:08 Premiere Date 01/16/19

When Sharks Swam the Great Plains
S2 E5 Length 11:45 Premiere Date 01/16/19

How Sloths Went From the Seas to the Trees
S2 E4 Length 11:45 Premiere Date 01/16/19

When Camels Roamed North America
S2 E3 Length 09:45 Premiere Date 01/16/19

When Birds Stopped Flying
S2 E2 Length 07:14 Premiere Date 01/16/19

When Rodents Rafted Across the Ocean
S2 E1 Length 09:59 Premiere Date 01/16/19

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