Sperm whale mothers form a babysitting circle to look after the calves while their own mothers dive deep for food.

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Only adult sperm whales are able dive into deep waters to hunt for squid so babysitting mums look after the kids.

The mothers form a babysitting circle, taking turns watching over other calves and going hunting themselves.

The babysitters even allowed the other mums' calves to nurse if they were hungry.

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