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Weddell Seals
A healthy adult Weddell seal can stay underwater for 20 minutes, and some of them even have the power to for over 1 hour. However, after giving birth, the mother seals have to some of their own iron stock by transferring iron from their livers to the milk they their pups so that their offspring can become better divers. This direct transfer of iron in reduced diving time for the mothers.
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