Could anyone give me some advice on my african grey, he seems to be picking at his feathers. Hes not doing it all the time, not plucking them, its like hes preening them but really hard, mainly his wing feathers, they are looking a bit frazzled on the edges now but he just keeps on at them and a little on his tail feathers, I have noticed as well that he seems a little more tired than normal and has started to have little naps in the afternoon. His routine hasnt changed and his diet is the same, could it be mites???