All Episodes

When Penguins Went From The Sky To The Sea

They evolved from a flying ancestor.

When the Sahara Was Green

The climate of the Sahara was completely different thousands of years ago.

How a Hot Planet Created the World's Biggest Snake

The greatest snake that the world ever saw was made possible by a warming planet.

When the Rainforests Collapsed

If it weren't for the collapse, our ancestors might never have made it out of the swamps.

A Short Tale About Diplodocus' Long Neck

Long necks gave sauropods an advantage when it came to food, but not in the way you think.

How South America Made the Marsupials

Throughout the Cenozoic Era marsupials flourished all over South America.

The Giant Dinosaur That Was Missing a Body

Other than its bizarre arms, very little material from this dinosaur had been found.

The Neanderthals That Taught Us About Humanity

Neanderthals actually behaved -- and likely thought and felt -- a lot like we do.

That Time the Mediterranean Sea Disappeared

How could a body of water as big as the Mediterranean just...disappear?

The Fuzzy Origins of the Giant Panda

The Fuzzy Origins of the Giant Panda

The Forgotten Story of the Beardogs

Beardogs are key to understanding an important branch of the mammal family tree.

Why Male Mammoths Lost the Game (w/ TierZoo!)

Why do most remains of mammoths found in the fossil record turn out to be male?

When Giant Hypercarnivores Prowled Africa

Hyaenodonts gave the world some of its largest terrestrial carnivorous mammals ever known.

How We Domesticated Cats (Twice)

How we domesticated cats twice.

Were These Monsters Inspired by Fossils?

Were these monsters inspired by fossils?

When Hobbits Were Real

Was it its own species? Or was it really just one of us?

The Case of the Dinosaur Egg Thief

The case of the dinosaur egg thief.

When Antarctica Was Green

When Antarctica was green.

When Giant Lemurs Ruled Madagascar

Just a few thousand years ago, the island of Madagascar was inhabited by giant lemurs.

How Pterosaurs Got Their Wings

How pterosaurs got their wings.

When Bats Took Flight

When Bats Took Flight

The Raptor That Made Us Rethink Dinosaurs

The raptor that made us rethink dinosaurs.

The Missing Link That Wasn’t

There is no missing link in our lineage, because that’s not how evolution works.

Was This Dinosaur a Cannibal?

Was this dinosaur a cannibal?

When Giant Deer Roamed Eurasia

Megaloceros was one of the largest members of the deer family ever to walk the Earth.

How Earth's First, Unkillable Animals Saved the World

How Earth's First, Unkillable Animals Saved the World

How Volcanoes Froze the Earth...Twice

How Volcanoes Froze the Earth...Twice

When We Met Other Human Species

We all belong to the only group of hominins on the planet today. But we weren’t alone.

When Ichthyosaurs Led a Revolution in the Seas

When Ihthyosaurs led a revolution in the seas.

When the Synapsids Struck Back

Our world is the way it is because of the time when the synapsids struck back.

How Evolution Works (And How We Figured It Out)

We’ll try to explain how evolution actually works and how we came to understand it.

The Hellacious Lives of the "Hell Pigs"

There is some evolutionary method to the anatomical madness that is the "hell pig."

The History of Climate Cycles (and the Woolly Rhino)

The History of Climate Cycles (and the Woolly Rhino) Explain

The Ghostly Origins of the Big Cats

Scientists have recently discovered a major clue about the origins of the big cats.

When We Took Over the World

When We Took Over the World

The Mystery Behind the Biggest Bears of All Time

The Mystery Behind the Biggest Bears of All Time

When We Tamed Fire

The ability to make and use fire has fundamentally changed the arc of our evolution.

When Giant Scorpions Swarmed the Seas

Sea scorpions thrived for 200 million years, coming in a wide variety of shapes and sizes.

When We First Made Tools

When We First Made Tools

The Island of Huge Hamsters and Giant Owls

The Island of Huge Hamsters and Giant Owls

How 7,000 Years of Epic Floods Changed the World

How 7,000 Years of Epic Floods Changed the World

The Humans That Lived Before Us

The Humans That Lived Before Us

How Blood Evolved (Many Times)

How Blood Evolved (Many Times)

When Humans Were Prey

Not too long ago, our early human ancestors were under threat of attack from predators.

Why Megalodon (Definitely) Went Extinct

What happened to the largest shark in history?

When Apes Conquered Europe

Today, apes live only in Africa and Asia but this wasn't always the case.

How Sloths Went From the Seas to the Trees

The story of sloths is one of astounding ecological variability.

When Camels Roamed North America

Camels' origins story begins in an environment you’d never expect: a rainforest.

About Eons

Join hosts Hank Green, Kallie Moore, and Blake de Pastino as they take you on a journey through the history of life on Earth. From the dawn of life in the Archaean Eon through the Mesozoic Era — the so-called “Age of Dinosaurs” -- right up to the end of the most recent Ice Age.

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