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October 19 2012

Dolphins 'stay awake for 15 days'


Dolphins can stay alert and active for 15 days or more by sleeping with one half of their brain at a time, scientists in the United States have learned.

The trick of keeping half the brain continuously awake is vital to the sea mammals' survival, experts believe.

It allows them to come to the surface every so often to breath, and remain constantly vigilant for sharks.

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