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on Aug 8, 2017
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Why Elephants Don’t Explode: How Nature Solves Big...
"Elephants in zoos sleep for four to six hours a day, but in their natural surroundings the elephants rested for only two hours, mainly at night." [1]
[1]
http://www.bbc.com/news/science-environment-39126993
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[1] http://www.bbc.com/news/science-environment-39126993