Hi I have 3 adult pekin ducks- 2 females and 1 male. The male has been looking very yellow--- his whole body, especially the stomach area. I know sometimes ducks look yellow when they are molting, and he has been definitely loosing feathers, but this seems to have been going on for several months now. Additionally both of my females have black and bluish spots on their beaks which look sort of like mold. I am concerned about the three of them and didn't know if they needed any sort of treatment or if these were just normal problems.