Why Do Cockatiels Shag Their Toys Why Are My Cockatiels Pulling Out The Baby's Feathers?

Why are my cockatiels pulling out the baby's feathers? - why do cockatiels shag their toys

Now I won 8 cockatiels. 3 are the other children and adults. Babies are almost fully developed, the springs are a little short. Sometimes, an adult woman and a child a pencil. But children are also fed. I've heard of feathers traction "before, but I do not understand why they do it. What do you think they" Help "I do not understand?