Why would a male suddenly pull the feathers out on both his wings, bloodying himself and the cage?

I don't know if you can help with this problem, but we have two cockatiels, a grey one called Buddy and a yellow called Snoopy. We have had both of them for about three months. They were found separately but live in the same cage and get on fairly well.

We came home yesterday afternoon and found Snoopy with blood all over him. He had been pulling out his feathers on both wings. There was blood on the bottom of the cage as well.

He didn't seem to be in any pain but he wasn't his usual chirpy self. We sat him under a lamp to keep him warm for around four hours before we went to bed. He seemed to be a little better this morning, but he still wasn't whistling (which is unusual because we can't normally shut him up) though he was eating and drinking.

Do you have any idea why he would do this now? We thought of mites but I'm sure if there were mites in the cage we would have noticed Buddy itching as well. I haven't noticed any change in behaviour in the last few days with either of them.

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I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.