Season 1
Today, apes live only in Africa and Asia but this wasn't always the case.
When Apes Conquered Europe
How Sloths Went From the Seas to the Trees
The story of sloths is one of astounding ecological variability.
How Sloths Went From the Seas to the Trees
When Camels Roamed North America
Camels' origins story begins in an environment you’d never expect: a rainforest.
When Camels Roamed North America
When Rodents Rafted Across the Ocean
How did Caviomorpha migrate from South American to Africa?
When Rodents Rafted Across the Ocean
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.
The Two People We're All Related To
Your Place in the Primate Family Tree
How did we get from a mouse-sized creature that looked more like a squirrel to you?
Your Place in the Primate Family Tree
Scientists have been working for decades to unlock the genetic secrets of the past.
Can We Get DNA From Fossils?
Is LH PV18 a Tarbosaurus bataar? Or a different theropod named Raptorex kriegsteini?
Did Raptorex Really Exist?
Human ancestors were already walking 3.6 million years ago. But who was first to walk?
When We First Walked
Life, Sex & Death Among the Dire Wolves
Dire wolves were real! Their remains taught us a lot about how they lived.
Life, Sex & Death Among the Dire Wolves
How a Supervolcano Made the Cenozoic’s Coolest Fossils
Yellowstone contains some of North America's most amazing fossil deposits.
How a Supervolcano Made the Cenozoic’s Coolest Fossils
How Horses Took Over North America (Twice)
Horses vanished from North America for 10,000 years until a mammal brought them back.
How Horses Took Over North America (Twice)
420 million years ago, some fish wore armor – and it may have served a surprising purpose.
When Fish Wore Armor
The Mystery of the Eocene’s Lethal Lake
In the 1800s, miners found beautifully preserved fossils of animals from the Eocene.
The Mystery of the Eocene’s Lethal Lake
Insects were the first animals to fly. Scientists are still working on how it happened.
When Insects First Flew
To celebrate our first anniversary together, we’d like to answer some of your questions.
FAQs From Our First Year
Tyrannosaurus rex had tiny arms. How did this happen, and why did it keep them?
How the T-Rex Lost Its Arms
Before a group of fish could live on dry land, they acquired the ability to breathe air.