It was definitely petite - much smaller than nearby Canada geese and mallards. The head was all white and rounded, neck short, and bill small. However, it did seem to have more of a grin than Ross's is supposed to show and there is a bit of a curve visible particularly on right side of margin between beak and head. The top and sides of upper bill are covered with warty growths - caruncles - which I read are typical of older male Ross's geese.
Here are photos.
|Ross's Goose in front of Canada geese|
|Ross's Goose 11/25/15 Lake Mayer Savannah|
|In this view, I see a bit of a curve and longer looking beak. Neck short.|
|Short neck, rounded head, warty growths on beak point to Ross's Goose|