Why do you never see baby squirrels? these are the only wild animal babies not normally seen?

You do see young ones about sometimes. It's actually pretty rare to see baby animals of any type, they tend to be very well hidden when they're still too young to defend themselves against predators.Why do you never see baby squirrels? these are the only wild animal babies not normally seen?
I've seen them at my bird-feeders with their mothers,Of course they aren't newborns;those are up in the nest,but they are about half the size of the adults and they roll around on the ground and play like kittens and chase each other up and down the tree-trunks.The black ones are the cutest(it's a color mutation of the common grey squirrel,and quite common in the U.S.)There are white ones,too,but I've never seen one,only a photograph.Why do you never see baby squirrels? these are the only wild animal babies not normally seen?
I have raised 3 baby squirrels
They are born in a nest, called a drey, hidden away in the branches of a tree. they won't leave until they are well grown, so look like adults.
I have often seen young squirrels quite big but not as big as an adult one. The babies are un the nest.
what about pigeons,never seen a baby pigeon either