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This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?

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It was thought that saltwater seas separated Central and South America millions of years ago.

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But a recent discovery may render that idea all wet.

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Because archaeologists in Panama have dug up the remains of ancient alligator relatives,

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which were freshwater creatures.

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The work is in the Journal of Vertebrate Paleontology.

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Excavations at the Panama Canal have turned up many fossils.

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Recently, two partial skulls were found embedded in rocks that date back more than 19 million years,

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which makes them the oldest crocodilian fossils ever found in Central America.

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The skulls are from two species of the freshwater reptiles called caimans.

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Modern caimans are related to North American alligators but live only in South America.

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To reach Panama, the caimans must have left South America around the beginning of the Miocene epoch, when ocean separated the two continents.

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These freshwater animals should only have been able to cross a short expanse of saltwater.

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So at the time, Central and South America may have been much closer than we thought.

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Either that, or those caimans hitched a ride.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.

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