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When a Tiny Land Bridge Triggered an Ice Age

Season 8 Episode 8 | 10m 27s

On land, the Isthmus of Panama kicked off possibly the greatest natural experiment in the history of life on Earth. In the water, this narrow strip of land did something completely different: it divided. And that division would have a much bigger effect on the planet than the land connection ever did.

Aired: 12/16/25
Extras
Around 300 million years ago sails were all the rage, but we're still not sure what they were for.
What about the Great Dying caused a global age of mutant plants?
During the Permian Period many tetrapods, or four-limbed vertebrates, took to life in the trees.
For millions of years after the Great Dying microbes ruled the Earth.
The Permian began with the formation of a supercontinent and ended in the biggest extinction ever.
The Permian began with the formation of a supercontinent and ended in the biggest extinction ever.
How did Homotherium evolve to be so successful? The answer may lie in the rise of the Tibetan plate.
The mystery of what non-flying dinosaurs were doing with their feathered wings has a new hypothesis.
What did ancient people once know about these bizarre megafauna that we’ve since forgotten?
5,700 years ago, woolly mammoths crossed a remote tundra island off Alaska.
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Around 300 million years ago sails were all the rage, but we're still not sure what they were for.
What about the Great Dying caused a global age of mutant plants?
During the Permian Period many tetrapods, or four-limbed vertebrates, took to life in the trees.
Life begins to rebound after the destruction of the mass extinction ending the Permian Period.
An apocalypse ended the Permian Period 252 million years ago, wiping out more than 80% of species.
The first saber-teeth and tusks evolve in the Late Permian and our ancestors, the cynodonts, appear.
For millions of years after the Great Dying microbes ruled the Earth.
An extinction in the Middle Permian decimates life, from a fossil reef to our ancient relatives.
The first herbivorous vertebrates evolve on the side of the amniote family tree leading to mammals.
Seed plants and amniotes adapt to dry climates, helping them thrive on Pangea in the Permian Period.