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TIL Dolphins sleep by resting one side of the brain at a time. This allows them to continue rising to the surface for air and to keep an eye open to watch out for predators.

TIL Dolphins sleep by resting one side of the brain at a time. This allows them to continue rising to the surface for air and to keep an eye open to watch out for predators. TIL Dolphins sleep by resting one side of the brain at a time. This allows them to continue rising to the surface for air and to keep an eye open to watch out for predators. Reviewed by M. Amaar Tahir on 12:01 AM Rating: 5

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