My mistake, when i kept cayugas I had all males by accident and had to get rid of them except for one, so i never saw them when they molted, but either way that is a flaw on a cayuga if the OP shows it. when i showed my only male he had merely to small individual white feathers on either side of his wings and the judge counted off. so since the bird has that many white feathers, and colored speculum feathers laced with white (no fluorescent green head) , my immediate thought was that it might be maybe a black swedish or a mix. I was also assuming for a bit that the the bird was a little young for a molt, considering it sounds like since the OP got it on there birthday and that this is there first year showing ducks that it wasn't that old. but i don't see the little duck curl of a drake so if its a female k&swaterfowl is probably right. sorry for any confusion.