This rare waterbird to Southern Arizona is a male Hooded Merganser photographed on a golf course pond in Benson. Although common to most of the Northern America at one time of the year or another -- it is uncommon to Arizona. Go figure that one out.
Another migrant bird that winters along the Pacific Coast, Gulf of California, and Gulf of Mexico is the Greater White-fronted Goose. This too, was photographed at Lakeside Park in Tucson: