Our Ancient Relative That Said 'No Thanks' To Life On Land

Around the time that some of our fishapod relatives were crawling out of the water, others were turning around and diving right back in.

Season 5 Episode 2 Length 08:59 Premiere: 10/04/22

Recent Episodes

Sensitive Teeth? Blame This Fish

S8 E12 Length 11:08 Premiere Date 03/03/26

The Fiery Rise of Flowering Plants

S8 E11 Length 10:45 Premiere Date 02/10/26

When Ancient Weeds Fooled Us

S8 E10 Length 11:37 Premiere Date 01/27/26

How Brawn Led to Brains

S8 E9 Length 12:14 Premiere Date 01/13/26

When a Tiny Land Bridge Triggered an Ice Age

S8 E8 Length 10:27 Premiere Date 12/17/25

What Was Greenland Like When it Was Green

S8 E7 Length 09:07 Premiere Date 12/02/25

Specials

When Dinosaurs Threw Up A Mystery

Length 09:15 Premiere Date 07/22/25

Did Dinosaurs' Extinction Give Us Fruit?

Length 10:47 Premiere Date 07/15/25

Why Paleontologists Can’t Stop Fighting About Spinosaurus

Length 08:37 Premiere Date 07/01/25

The Dinosaurs Too Big To Be Dinosaurs

Length 12:22 Premiere Date 06/17/25

Season 5 Episodes

Show Episodes

Show Clips & Previews

A Natural History of Mars

S5 E22 Length 11:03 Premiere Date 05/09/23

The Invisible Barrier Keeping Two Worlds Apart

S5 E21 Length 08:03 Premiere Date 05/02/23

It's Becoming Very Clear That Birds Are Not Normal

S5 E20 Length 08:40 Premiere Date 04/25/23

When Plants Doubled Their DNA

S5 E19 Length 08:52 Premiere Date 04/13/23

We Were Wrong About The Dodo

S5 E18 Length 07:16 Premiere Date 04/04/23

Nautiloids Thrived For 500 Million Years Until They Appeared

S5 E17 Length 09:54 Premiere Date 03/28/23

The Hidden Genes That Make Us Human

S5 E16 Length 09:11 Premiere Date 03/14/23

That Time the American West Blew Up

S5 E15 Length 09:57 Premiere Date 03/07/23

How a Mass Extinction Changed Our Brains

S5 E14 Length 10:42 Premiere Date 03/01/23

The Mystery Of The Mashed-Up Dinosaurs

S5 E13 Length 07:23 Premiere Date 02/07/23

These Fossils Were Supposed To Be Impossible

S5 E12 Length 09:26 Premiere Date 02/07/23

Could Neanderthals Use Symbolism?

S5 E11 Length 08:09 Premiere Date 01/31/23

When Our Culture Changed Our DNA

S5 E10 Length 09:19 Premiere Date 01/19/23

These Creatures Were Darwin's Greatest Enemy

S5 E9 Length 09:58 Premiere Date 01/10/23

How Did Our Most Famous Ancestor Really Die?

S5 E8 Length 07:20 Premiere Date 12/14/22

When A Marsupial Became An Apex Predator

S5 E7 Length 10:04 Premiere Date 12/06/22

We Met Neandertals Way Earlier Than We Thought

S5 E6 Length 07:28 Premiere Date 11/16/22

How Plate Tectonics Gave Us Seahorses

S5 E5 Length 07:20 Premiere Date 11/08/22

Are We All Actually Archaea?

S5 E4 Length 08:21 Premiere Date 10/25/22

Darwin Missed An Example of Evolution Right Under His Nose

S5 E3 Length 08:53 Premiere Date 10/18/22