Skip to main content

Up Next

When Sharks Swam the Great Plains

When Sharks Swam the Great Plains

Season 2 Episode 5
11:45

When Apes Conquered Europe

Season 2 Episode 6
8:08
When Humans Were Prey

When Humans Were Prey

Season 2 Episode 8
9:21
How Blood Evolved (Many Times)

How Blood Evolved (Many Times)

Season 2 Episode 9
9:56
The Humans That Lived Before Us

The Humans That Lived Before Us

Season 2 Episode 10
11:52
The Island of Shrinking Mammoths

The Island of Shrinking Mammoths

Season 2 Episode 11
11:20
The Giant Bird That Got Lost in Time

The Giant Bird That Got Lost in Time

Season 2 Episode 15
8:33
When We First Made Tools

When We First Made Tools

Season 2 Episode 16
9:08
Back to Show
Eons

How Sloths Went From the Seas to the Trees

Season 2 Episode 4

The story of sloths is one of astounding ecological variability, with some foraging in the seas, others living underground, and others still hiding from predators in towering cliffs. So why are their only living relatives in the trees?

Support Provided By
Season
What's the Oldest Beverage
11:55
What was the first ever drink?
The Mystery of South America's False Horses
9:45
How did the "false horse," Thoatherium, and its relatives survive?
When The Atlantic Ripped Open A Supercontinent
10:21
Did you know volcanoes created the Atlantic Ocean that we know today?
The Second Time Sponges Took Over The World
8:04
Learn about how researchers have discovered a piece of a weird, but critical, time in the deep past…
No Single Cradle of Humankind
10:46
Maybe there wasn’t just one so-called "cradle of humankind"?
The Hazy Evolution of Cannabis
10:18
How did such a strange plant like cannabis come to be in the first place?
What Will Earth Be Like 300 Million Years From Now?
9:34
We’re taking a look towards the deep future. After all, the story is far from over.
What Was The Earliest Surgery?
7:59
When did we start practicing medicine in its varied, complex forms?
How Snake Venom Sparked An Evolutionary Arms Race
9:11
For some, the rise of venomous elapid snakes was an almost apocalyptic catastrophe.
Why Is It So Hard to Tell the Sex of a Dinosaur?
12:07
When you only have fossils, how do you know if a dinosaur is female or male?
Animals Are Older Than We Thought
11:57
What are animal-like fossils doing in rocks a billion years old?
Our Most Mysterious Extinct Cousins
9:41
Paranthropus lived alongside our ancestors. If we are still here, why aren’t they?
Active loading indicator