For the last week and a half my duck has had very irritated looking eyes and is itching her head alot. She has just recently scratched it to an open sore. I had people tell me it could be that shes not getting enough water to play in so I've started bringing her in a few times a week to play in the bathtub along with water in her pen but it does not seem to be helping her much. What could be causing her to be so itchy? We have had quite a few weeks of it getting below freezing at night so I would think if it were bug related they would have been gone by now because of the freezing weather. She lives with 5 chickens and they dont seem to be having any problems from what I can tell. Please help me if you can. Thanks.