In most mammalian species there is a period of time where the child is dependent upon the parent. After such period of time the child then knows enough to survive on its own or to at least not immediately die without its mother’s care. When such condition is met, inevitably there will come a day whenever the child realizes that (s)he is tired of all of the bitching and leaves.
In a lot of species the parent gives them a subtle nudge, and then progressively less subtle nudges – including literally nudging them out of the nest.
Carnivores have been known to actively drive their young out of the territory, as they are ultimately competing for food.
More gregarious species like pidgeons or buffalo may never leave the herd, but the parents will stop feeding them when it’s time.
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