Some of the identification points for the "Richardson's" race of Cackling Goose include:
1) Much smaller size compared to Canada Goose, appearing closer to the size of a Mallard.
2) Usually much grayer or paler than Canada Goose, appearing silvery.
3) Bill is very short and stubby compared to that of Canada Goose.
4) Head appears 'blocky' with a steep, vertical forehead above the bill.
5) Back and wing feathers have broad, pale fringing, causing it to look more 'scalloped' than Canada Goose.