Grey seal pups have an intensive maternal care period; over the course of 18-21 days they are weaned and their mothers leave them to go back to sea. To make this feasible, they have to gain a kilo or two every day. When they are young, their skin hangs loose to make room for all the fat they are going to build up. They look almost like a puppet. But once they gain the weight, they can hardly move they are so tubby!
After: somewhere between 3-4 weeks old.
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