Bottlenose Dolphin
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skjames
Dolphins must breathe every few minutes. How and where do they sleep?
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Damian
Replied to:  Dolphins must breathe every few minutes. How and where do...
It has been shown in EEG studies that dolphins shut down half of their brains for approximately 2 hours at a time, then reverse the process by shutting down the other half.

Here's a good article on the subject:
http://www.scientificamerican.com/article.cfm?id=how-do-whales-and-dolphin
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