Which animal only spends four days nursing their baby?

Hooded Seals – found only in the central and western North Atlantic, their pups are usually around 1 meter (3 ft 3 in) long at birth and weigh about 24 kilograms (53 lb).

Nursing the baby only lasts around four days, the shortest lactation period of any mammal, a period during which the pup doubles in size, gaining around 7 kilograms per day. This is possible thanks to the high-fat content of the milk they drink, which is around 60%.

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