I didn't get a pick of them they are to far a way to tell anything on a pic. We have seen them on the water on MT and the Missouri. They look to be solid black. They are not coots. To big for coots and they have a dark bill. Is there a black duck or black goose that I don't know about? Just noticed them this year. Looked in my bird book and couldn't find anything. Could it just be a color phase they are going through? It is 1 of those things that when the fish aren't biting you set around and observe stuff and then ask questions you don't have answers for.