Which animal only spends four days nursing their baby?

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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%.

Other than humans, what is the only primate capable of having blue eyes?

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Black Lemur

Although it’s common to see light eyes in animals such as dogs, cats or even parrots, most of them have brown or dark eyes (irises). Among primates, which include humans, monkeys, apes and other species there is only one exception to blue eyes other than humans, black lemurs.

The blue eyes of humans and lemurs are caused by a single nucleotide polymorphism. In simple terms, ‘blue’ is caused by a single spot in the genes that changed.

The same spot mutated separately in humans and lemurs – something called convergent evolution.