My two big 'Scovy girls are sick for the first time in their 2-year-old lives. The call ducks and chickens they've been living with and eating and drinking with are not sick (yet ) but I don't know what to do. The only symptoms are coughing (kinda like hacking) and that my black Muscovy, Lucy, has some feather loss on her head. Not sure why. Her sister looks fine, and we have no large males that mate with either of them. The chickens don't seem to bother them either. And they never have. Can I treat them with anything while they stay in with the chickens? Snow is still on the ground and they stay in with the chickens during the winter. If this thing was going to go away, it would have by now. I don't know what this illness is and how to treat it. There's no mucus, eye-crust or goo, nose-crust or goo, or anything else. Just violent coughing fits and feather-loss on one of my girls.