On Ross's Goose, the feathers of the
cheek meet the base of the bill forming a straight line top to
bottom rather than a forward arc as on a Snow Goose. It has a
shorter stubbier bill than a Snow Goose and does not have a grinning
patch. At the base of the bill, this Ross's Goose has purplish-grey
caruncles or warty protuberances, which become more pronounced with
age. Whitby on 4 March 2012.