Lunchtime Photo

What kind of duck is this? Is it just a common duck type of duck that happens to be gray? They seem to hang out with our white ducks a lot. Does that mean they’re young ducks who will grow up to be white ducks? Or maybe white swans like in the fairy tale? Or is this just a breed of duck that happens to be gray? We’ve never seen ducks around here like this, so it’s all new to us.