Resume Watching
Use one of the services below to sign in to PBS:
You've just tried to add this video to your Watchlist so you can watch it later. But first, we need you to sign in to PBS using one of the services below. You’ll be able to manage videos in your Watchlist, keep track of your favorite shows, watch PBS in high definition, and much more!
You've just tried to select this program as one of your favorites. But first, we need you to sign in to PBS using one of the services below. You’ll be able to manage videos in your Watchlist, keep track of your favorite shows, watch PBS in high definition, and much more!
To get you watching PBS in high definition we need you to sign in to PBS using one of the services below. You'll be able to manage videos in your Watchlist, keep track of your favorite shows, watch PBS in high definition, and much more!
Don’t have a PBS Account? Create one nowCreate a PBS account
By creating an account, you acknowledge that PBS may share your information with our member stations and our respective service providers, and that you have read and understand the Privacy Policy and Terms of Use.
Already a NHPBS member? You may have an unactivated NHPBS Passport member benefit. Check to see.
Eons
When Sharks Swam the Great Plains
Ep67 | 11m 45s
Share this video: Share this video on FacebookFacebookShare this video on TwitterTwitter
How Sloths Went From the Seas to the Trees
The story of sloths is one of astounding ecological variability.
Ep66 | 11m 45s
When Camels Roamed North America
Camels' origins story begins in an environment you’d never expect: a rainforest.
Ep65 | 9m 45s
When Birds Stopped Flying
For birds that can't fly, how did Ratites end up all over the world?
Ep64 | 7m 15s
When Rodents Rafted Across the Ocean
How did Caviomorpha migrate from South American to Africa?
Ep63 | 9m 59s
The Two People We're All Related To
Two humans managed to pass on a very small fraction of their genomes to all of us.
Ep62 | 8m 44s
Your Place in the Primate Family Tree
How did we get from a mouse-sized creature that looked more like a squirrel to you?
Ep61 | 11m 35s
When Giant Amphibians Reigned
A look at when Temnospondyls Amphibians existed for 210 million years
Ep60 | 9m 51s
Can We Get DNA From Fossils?
Scientists have been working for decades to unlock the genetic secrets of the past.
Ep59 | 11m 22s
Did Raptorex Really Exist?
Is LH PV18 a Tarbosaurus bataar? Or a different theropod named Raptorex kriegsteini?
Ep58 | 12m 27s
When We First Walked
Human ancestors were already walking 3.6 million years ago. But who was first to walk?
Ep57 | 10m 56s
Life, Sex & Death Among the Dire Wolves
Dire wolves were real! Their remains taught us a lot about how they lived.
Ep56 | 9m 15s
The Rise and Fall of the Bone-Crushing Dogs
What happened to the biggest dogs that ever lived?
Ep55 | 8m 29s
How a Supervolcano Made the Cenozoic’s Coolest Fossils
Yellowstone contains some of North America's most amazing fossil deposits.
Ep54 | 9m 15s
How Horses Took Over North America (Twice)
Horses vanished from North America for 10,000 years until a mammal brought them back.
Ep53 | 9m 8s
When Birds Had Teeth
How did Archaeopteryx relate to today’s birds? Its teeth provide a major clue.
Ep52 | 11m 29s
When Fish Wore Armor
420 million years ago, some fish wore armor – and it may have served a surprising purpose.
Ep51 | 9m 37s
The Mystery of the Eocene’s Lethal Lake
In the 1800s, miners found beautifully preserved fossils of animals from the Eocene.
Ep50 | 7m 59s
When Insects First Flew
Insects were the first animals to fly. Scientists are still working on how it happened.
Ep49 | 8m 38s
FAQs From Our First Year
To celebrate our first anniversary together, we’d like to answer some of your questions.
Ep48 | 9m 20s
How the T-Rex Lost Its Arms
Tyrannosaurus rex had tiny arms. How did this happen, and why did it keep them?
Ep47 | 6m 54s
When Fish First Breathed Air
Before a group of fish could live on dry land, they acquired the ability to breathe air.
Ep46 | 8m 40s
Where Did Viruses Come From?
Where did viruses come from and how did they evolve? Are viruses alive?
Ep45 | 7m 29s
Why Triassic Animals Were Just the Weirdest
Why the Triassic was full of creatures that look a lot like other, more modern species.
Ep44 | 9m 7s