Why human babies cannot walk immediately meanwhile other mammal babies can walk immediately
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If by other mammal babies you mean horses, cows, and deers, consider that those types of mammals represent a pretty small sample of the category. Kittens, mice, puppies, rabbits, and many other mammals are born completely blind. Marsupials are born the size of a jelly bean and have to finish gestating in the pouch.
Grazing animals have to be able to walk shortly after birth because they rarely have access to sheltered areas where they can raise newborns. Most other mammals raise their young in some kind of burrow or den. Humans evolved to carry our babies around- they have the grip reflex so they could hold onto the fur of our ancestors.
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