I am trying to determine why could be causing this issue. We inherited 3 peafowl when we purchased our farm last November. I don't recall what the peacock's tail looked like but currently, he is losing tail feathers and he's started pecking his right shoulder to the point it's bleeding. I have checked his feathers for mites (I am very familiar with mites having dealt with it in our breeding of canaries and other birds). I found nothing even using a geologist's loupe. I have dusted with food grade diatomaceous earth today and will dust with a medicated powder to be on the safe side. None of my other birds (2 turkeys, 4 ducks and 35 chickens all living together) show no reaction like feather plucking or scratching, picking etc. The two peahens show nothing either. Some of the feathers falling out (or him plucking) do show blood in the tips while some don't. I don't recall seeing him moult his tail feathers last fall, but I could have missed it, he's only 2 going on 3. So, since everyone is healthy besides this peacock (pecking at himself). .. Any suggestions as to what could be causing him to do this? They have a lot of room to move around, it's dry inside, although snow is melting outside, he's active outside and inside. Thank you for your assistance.