Appearing very much like a miniature Snow Goose, Ross's Goose is the only other goose in North America that is all white with black wingtips. In evaluating a white goose in the field, observers should note head shape and bill details, in addition to overall body size. Ross's has a rounder head and a stubbier bill which lacks the obvious grin patch of a Snow Goose*.
Ross's Geese are rarely encountered in New England, with just a few spotted in a typical year. The individual pictured here was found with a flock of Canada Geese in Fort Fairfield, Maine in late September.
*For a sketch comparison of each, as well as a discussion of hybrids, see David Sibley's Identification of White Geese blog post.