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Mammals

In Our Time

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The Ismaeth of Panama

This happened about 3 million years ago, so we're coming much closer to my mind. Can you take up Richard's story though? I mean why it was important. Anyway, tell us about the joining of our three million years ago. We're getting very close to today really. And what happened? The Ismaeth of Panama didn't exist before that. It affected two things, it affected the ocean currents and the climate. So North and South America joined up? Yes. There was a land bridge. But it separated, it made great oceans instead of one swirling sea. That's right. For the first time, the Arctic actually had no heat source and it started to get cooled

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