Dolphins sleep with only half of their brain and with one eye open so they can watch for predators and other threats.

Dolphins sleep with only half of their brain and with one eye open so they can watch for predators and other threats.

2. A dolphin named Pelorus Jack regularly guided ships in New Zealand through treacherous waters until his disappearance in 1912.  He was even protected by the law!

2. A dolphin named Pelorus Jack regularly guided ships in New Zealand through treacherous waters until his disappearance in 1912. He was even protected by the law!

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