It ended up being frostbite. My hen's toes got wet and then she went out in the cold, so her toes got frostbite. Now my hen has only half of all her toes fallen off. Your duck should be fine as long as there isn't any bleeding or anything, he should still be able to walk okay. The only problem I would see is how can a duck swim with one foot?Hi I had the same thing happen to me but it was my muscovy duck bubba. His foot was black then I went down today and he had not foot. I was freaking out. Does anyone know what it is?