We have two cockatiels = male and female. They had 3 babies who are now 10 weeks old and doing very well. Curley our male, however, loves to preen which I understand is a way of bonding. However, when he preens he starts out nice and gentle and then proceeds to put feathers out of the top of their heads. My poor female is almost bald on top. He is now starting to do it with the young ones.
Why is he doing this and how can we stop him. I know it is a natural thing, but they all screech when he pulls out a feather and they don't fight him back. Is this a natural behavor for a male cockatiel?