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

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When summer hits, I dread jogging outside.

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But a study finds that elephants can be in true danger in the heat.

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As creatures get bigger, they have smaller surface-area-to-body-volume ratios.

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Fully grown Asian elephants thus pack a lot of mass into a body with a relatively small surface area.

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And surface area limits how much body heat you can dissipate.

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For the study, two female elephants in the Audubon Zoo in New Orleans walked around a half-mile track under various conditions.

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The outdoor temperature during these sessions ranged from a chilly 8 degrees Celsius to a scorching 35 degrees.

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Sunny, hot days were the worst.

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The already limited hide is now itself heated by the sun.

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With the equivalent of a busted radiator, the elephants retained 56 to 100 percent of their body heat internally.

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Which could make a mere four hours of exercise fatal.

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The research on elephant exertion is in the Journal of Experimental Biology.

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Fortunately, elephants have ways to beat the heat:

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shift activity to after dark and, of course, go for a dip.

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

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