Dolphins can stay constantly alert for more than two weeks
by sleeping with only half of their brains, researchers say.
These findings suggest how dolphins can keep on the
constant lookout
for sharks, investigators added.
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.
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