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The Best Episodes of Eons Season 4

Every episode of Eons Season 4 ranked from best to worst. Discover the Best Episodes of Eons Season 4!

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

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  1. #1 Fan Favorite
    Eons Season 4 Episode 1 - That Time the Mediterranean Sea Disappeared
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    #1 - That Time the Mediterranean Sea Disappeared

    S4:E1

    How could a body of water as big as the Mediterranean just...disappear? It would take decades and more than 1,000 research studies to even start to figure out the cause -- or causes -- of one of the greatest vanishing acts in Earth’s history.

    Director:Unknown
    Writer:Unknown

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  2. Eons Season 4 Episode 2 - The Neanderthals That Taught Us About Humanity
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    #2 - The Neanderthals That Taught Us About Humanity

    S4:E2

    Throughout the first half of the 20th century, Neandertals were thought to have been…primitive. Unintelligent, hunched-over cavemen, for lack of a better word. But the discoveries made in that Iraqi cave provided some of the earliest clues that Neanderthals actually behaved -- and likely thought and felt -- a lot like we do.

    Director:Unknown
    Writer:Unknown

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  3. Eons Season 4 Episode 3 - The Giant Dinosaur That Was Missing a Body
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    #3 - The Giant Dinosaur That Was Missing a Body

    S4:E3

    From end to end, its forelimbs alone measured an incredible 2.4 meters long and were tipped with big, comma-shaped claws. But other than its bizarre arms, very little material from this dinosaur had been found: no skull, no feet, almost nothing that could give experts a fuller picture of what this dinosaur actually was.

    Director:Unknown
    Writer:Unknown

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  4. Eons Season 4 Episode 4 - How South America Made the Marsupials
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    #4 - How South America Made the Marsupials

    S4:E4

    Throughout the Cenozoic Era -- the era we’re in now -- marsupials and their metatherian relatives flourished all over South America, filling all kinds of ecological niches and radiating into forms that still thrive on other continents.

    Director:Unknown
    Writer:Unknown

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  5. Eons Season 4 Episode 5 - A Short Tale About Diplodocus' Long Neck
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    #5 - A Short Tale About Diplodocus' Long Neck

    S4:E5

    Long necks gave sauropods a huge advantage when it came to food, but not in the way you think. And this benefit would allow them to become the biggest terrestrial animals of all time!

    Director:Unknown
    Writer:Unknown

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  6. Eons Season 4 Episode 6 - When the Rainforests Collapsed
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    #6 - When the Rainforests Collapsed

    S4:E6

    The Carboniferous Rainforest Collapse set the stage for a takeover that would be a crucial turning point in the history of terrestrial animal life. If it weren’t for that time when the rainforests collapsed - in an extinction event that you probably haven’t heard of - our ancestors might never have made it out of the swamps.

    Director:Unknown
    Writer:Unknown

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  7. Eons Season 4 Episode 7 - How a Hot Planet Created the World's Biggest Snake
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    #7 - How a Hot Planet Created the World's Biggest Snake

    S4:E7

    About 59 million years ago, the largest animal lurking in the ancient forests of Colombia by far was Titanoboa - the largest snake ever known. It’s only been in the past few years that we’ve put together the many pieces of this puzzling creature, but it turns out that the greatest snake that the world ever saw was made possible by a warming planet.

    Director:Unknown
    Writer:Unknown

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  8. Eons Season 4 Episode 8 - When the Sahara Was Green
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    #8 - When the Sahara Was Green

    S4:E8

    The climate of the Sahara was completely different thousands of years ago. And we’re not talking about just a few years of extra rain. We’re talking about a climate that was so wet for so long that animals and humans alike made themselves at home in the middle of the Sahara.

    Director:Unknown
    Writer:Unknown

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  9. Eons Season 4 Episode 9 - When Penguins Went From The Sky To The Sea
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    #9 - When Penguins Went From The Sky To The Sea

    S4:E9

    Today, we think of penguins as small-ish, waddling, tuxedo-birds. But they evolved from a flying ancestor, were actual giants for millions of years, and some of them were even dressed a little more casually.

    Director:Unknown
    Writer:Unknown

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  10. Eons Season 4 Episode 10 - How the Egg Came First
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    #10 - How the Egg Came First

    S4:E10

    The story of the egg spans millions of years, from the first vertebrates that dared to venture onto land to today’s mammals, including the platypus, and of course birds. Like chickens? We’re here to tell you: The egg came first.

    Director:Unknown
    Writer:Unknown

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  11. Eons Season 4 Episode 11 - How Dogs (Eventually) Became Our Best Friends
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    #11 - How Dogs (Eventually) Became Our Best Friends

    S4:E11

    We’re still figuring out the details, but most scientists agree that it took thousands of years of interactions to develop our deep bond with dogs. When did they first become domesticated? Where did this happen? And what did the process look like, in terms of genetics and anatomy?

    Director:Unknown
    Writer:Unknown

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  12. Eons Season 4 Episode 12 - When a Billion Years Disappeared
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    #12 - When a Billion Years Disappeared

    S4:E12

    In some places, the rocks below the Great Unconformity are about 1.2 billion years older than those above it. This missing chapter in Earth’s history might be linked to a fracturing supercontinent, out-of-control glaciers, and maybe the diversification of life itself.

    Director:Unknown
    Writer:Unknown

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  13. Eons Season 4 Episode 13 - The Risky Paleo Diets of Our Ancestors
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    #13 - The Risky Paleo Diets of Our Ancestors

    S4:E13

    We can track our history of eating just about anything back through the fossil record and see the impact it’s had on our evolution. Throughout time, part of the secret to our success as a species has been our early - and sometimes fatal - experimentation with food.

    Director:Unknown
    Writer:Unknown

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  14. Eons Season 4 Episode 14 - How the Andes Mountains Might Have Killed a Bunch of Whales
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    #14 - How the Andes Mountains Might Have Killed a Bunch of Whales

    S4:E14

    At a site known as Cerro Ballena or Whale Hill, there are more than 40 skeletons of marine mammals -- a graveyard of ocean life dating back 6.5 million to 9 million years ago, in the Late Miocene Epoch. But the identity of the killer that they finally settled on might surprise you.

    Director:Unknown
    Writer:Unknown

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  15. Eons Season 4 Episode 15 - How Plants Caused the First Mass Extinction
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    #15 - How Plants Caused the First Mass Extinction

    S4:E15

    In the middle of the Cambrian, life on land was about to get a little more crowded. And those newcomers would end up changing the world. The arrival of plants on land would make the world colder, drain much of the oxygen out of the oceans and eventually, it would help cause a massive extinction event.

    Director:Unknown
    Writer:Unknown

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  16. Eons Season 4 Episode 16 - The Two Viruses That We’ve Had For Millions of Years
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    #16 - The Two Viruses That We’ve Had For Millions of Years

    S4:E16

    There’s one kind of herpesvirus that’s specific to one species of primate, and each virus split off from the herpesvirus family tree when the primate split off from its own tree. But of course, humans are a special kind of primate.

    Director:Unknown
    Writer:Unknown

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  17. Eons Season 4 Episode 17 - How We Identified One of Earth’s Earliest Animals
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    #17 - How We Identified One of Earth’s Earliest Animals

    S4:E17

    Scientists had no idea what type of organisms the life forms of the Ediacaran were—lichen, colonies of bacteria, fungi or something else. It turns out, the key to solving the puzzle of Precambrian life was a tiny bit of fossilized fat.

    Director:Unknown
    Writer:Unknown

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  18. Eons Season 4 Episode 18 - When Dinosaur Look-Alikes Ruled the Earth
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    #18 - When Dinosaur Look-Alikes Ruled the Earth

    S4:E18

    There were a huge number of croc-like animals that flourished during the Triassic Period. Dinosaurs had just arrived on the scene but it was these animals that truly ruled the Earth, becoming both abundant and diverse.

    Director:Unknown
    Writer:Unknown

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  19. Eons Season 4 Episode 19 - The World Before Plate Tectonics
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    #19 - The World Before Plate Tectonics

    S4:E19

    There was a time in Earth’s history that was so stable, geologists once called it the Boring Billion. But the fact is, this period was anything but boring. In fact, it set the stage for our modern version of plate tectonics - and probably for the rise of life as we know it.

    Director:Unknown
    Writer:Unknown

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  20. Eons Season 4 Episode 20 - When Dinosaurs Chilled in the Arctic
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    #20 - When Dinosaurs Chilled in the Arctic

    S4:E20

    All told, the Arctic in the Cretaceous Period was a rough place to live, especially in winter. And yet, the fossils of many kinds of dinosaurs have been discovered there. So how were they able to survive in this harsh environment?

    Director:Unknown
    Writer:Unknown

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  21. Eons Season 4 Episode 21 - How the Walrus Got Its Tusks
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    #21 - How the Walrus Got Its Tusks

    S4:E21

    The rise and fall of ancient walruses, and how modern ones got their tusks, is a story that spans almost 20 million years. And while there are parts of the story that we’re still trying to figure out, it looks like tusks didn’t have anything to do with how or what these animals ate.

    Director:Unknown
    Writer:Unknown

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  22. Eons Season 4 Episode 22 - The Story of the Dino Stampede
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    #22 - The Story of the Dino Stampede

    S4:E22

    To try to solve the puzzle of Lark Quarry, experts have turned to a special subfield of paleontology -- paleoichnology, or the study of trace fossils -- to reconstruct exactly what happened on that spot, on that day, nearly 100,000 millennia ago.

    Director:Unknown
    Writer:Unknown

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  23. Eons Season 4 Episode 23 - The Biggest Frog that Ever Lived
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    #23 - The Biggest Frog that Ever Lived

    S4:E23

    Untangling the origins of Beelzebufo -- the giant frog that lived alongside the dinosaurs -- turns out to be one of the most bedeviling problems in the history of amphibians.

    Director:Unknown
    Writer:Unknown

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  24. Eons Season 4 Episode 24 - The Dinosaur Who Was Buried at Sea
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    #24 - The Dinosaur Who Was Buried at Sea

    S4:E24

    Paleontologists have been studying these dinosaurs since the 1830s, but nobody had ever found a specimen like Borealopelta before. The key to all of this exceptional preservation was where ended up after it died and how it got there.

    Director:Unknown
    Writer:Unknown

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  25. Eons Season 4 Episode 25 - How We Figured Out Fermentation
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    #25 - How We Figured Out Fermentation

    S4:E25

    Thanks to a recent adaptation, instead of getting sick from the boozy, fermented fruits, one of our primate ancestors could digest them safely, and get more calories at the same time. This new superpower would open up a whole new nutritional landscape for us: fermented foods.

    Director:Unknown
    Writer:Unknown

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Season 4 Ratings Summary

"That Time the Mediterranean Sea Disappeared" is the best rated episode of "Eons" season 4. It scored /10 based on 0 votes. Directed by Unknown and written by Unknown, it aired on 1/9/2020. This episode is rated 0.0 points higher than the second-best, "The Neanderthals That Taught Us About Humanity".