This medium-sized goose has two color morphs, formerly considered separate species: white and blue. All have pink bills with black “lipstick,” and pink legs and feet. The white morph is mostly white, with black wingtips. The blue morph is mostly grayish brown overall, with a white head and neck, and white on the underside of the wing. Intermediate forms occur, and immatures look different from adults. The calls are loud and nasal.
Similar species: Ross’s goose has a shorter neck and bill and is the size of a mallard. It lacks the “lipstick” or “grinning” marks on the bill and instead has a blue-green warty patch saddling the upper bill near the base. Note that hybrids between snow goose and Ross’s goose are not rare.