Dolphins have got the ability to switch off half of their brain, according to marine researchers. This way they stay awake for days, so they are able to swim to the surface and breathe and are constantly aware of their surroundings.
Unlike land mammals, dolphins sleep with only part of their brains at any time, past research has suggested. Half of their brains rest, while the other half remains “awake,” and dolphins regularly switch which side is active.
“After being awake for many hours or days, humans and other animals are forced to stop all activity and sleep,” said researcher Brian Branstetter, a marine biologist at the National Marine Mammal Foundation in San Diego. “Dolphins do not have this restriction, and if they did, they would probably drown or become easy prey.”
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