How can the thrush birds change the hair?

Thrus bird's face hair changes, even if the hair is changed.Usually, the thrush will change the hair first, then the wings will be half, and then the tail feathers will be changed. At this time, it will be changed by half. After that, the fluff on it will be changed.This bird is usually inhabited in a shrub or bamboo forest. It is relatively timid and often foraged in the grass, and the distance is not far away.It is good at singing and loud voice, so it is often raised as pets. It is very mixed with food, but it is mostly insects as food, and can also eat foods and tender vegetables such as plant.