What's the use of a parrot shedding its skin?

The parrot changed its feathers to prove that it has grown taller again. They change seasons in spring so that it won't be too hot in summer. They change them in autumn so that they can survive the winter. Artificial plucking will only kill them. Because their feathers are attached to blood vessels, only old feathers will naturally fall off. Of course, if only a small amount of plucking can only hurt them, it will not lead to death. It's not molting, it's plucking! ! !