At least 11 subspecies of Canada Goose have been recognized, although only a couple are distinctive. In general, the geese get smaller as you move northward, and darker as you go westward. Actually, the four smallest forms are now considered a different species: the Cackling Goose.
Some migratory populations of the Canada Goose are not going as far south in the winter as they used to. This northward range shift has been attributed to changes in farm practices that make waste grain more available in fall and winter, as well as changes in hunting pressure as well as changes in weather patterns.
Strange swimmer
We watched this goose swim like this for about 15 minutes covering over 100 yards. It didn't seem to be looking for food and didn't seem "afraid" of anything. It finally started swimming "normally" and eventually flew off. Strange behavior to us that we'd never seen before.