We had some adorable visitors the other day... two teenager mergansers. That's what we've surmised, anyway, by the fluff on the backs of their heads. We usually only get mallards and Canada geese, these two were a real treat.
They spent all day diving for goldfish and frogs. My dad wasn't too pleased and wanted to chase them off but I wouldn't let him. They were gone the next morning anyway... I hope they come back!