One of my younger muscovy drakes isn't looking too well, I'm not sure what to do for him. I don't think he's eatten in a few days. He's been out and about with the rest of the ducks but today I found him in the barn by himself. He's just kind of blah looking, stands around, head kinda tucked down, body straighter up than usual. I gave him some mash with warm water but he seems to have no interest in it. Anything else I could do for him? Thanks!