Up Next
Back to Show
Eons
When Sharks Swam the Great Plains
Season 2
Episode 5
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.
Support Provided By
7:32
Scientists have recently discovered a major clue about the origins of the big cats.
7:50
The climate of the Sahara was completely different thousands of years ago.
7:45
The greatest snake that the world ever saw was made possible by a warming planet.
7:40
If it weren't for the collapse, our ancestors might never have made it out of the swamps.
9:18
Long necks gave sauropods an advantage when it came to food, but not in the way you think.
9:51
Throughout the Cenozoic Era marsupials flourished all over South America.
12:00
Other than its bizarre arms, very little material from this dinosaur had been found.
9:09
Neanderthals actually behaved -- and likely thought and felt -- a lot like we do.
11:10
How could a body of water as big as the Mediterranean just...disappear?
9:37
Beardogs are key to understanding an important branch of the mammal family tree.