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The Killer Whales are so interesting. Some scientists have studied the whales for many years. They have found that when whales sleep, only half of there brain shuts down to at a time. When they sleep they still have to come up for air. Therefor only half of there brain sleeps at a time. You can find more information here: http://www.seaworld.org/ask-shamu/faq.ht…
