probable Cackling Goose (left) with Canada Goose - Turner's Falls, Franklin Co., MA. October 12th, 2010.
Probable - because I was a bit put off by the size of this bird, even though the basic proportions, and especially the head and bill shape looked very good for Richardson's Cackling Goose (B.h. hutchinsii). I came across this bird on my third scan of the Canada Goose flock (c.600) at Turner's Falls power canal. Geese were already departing Northward when I found it so I really didn't have too much time to work on it. Had it been smaller, I don't think I would have too much of a problem with it being a Cackling Goose but the size, I think, could be an issue. Even so, it retained its small billed appearance and 'blocky' head-shape at all times.
Large male Richardson's Cackling Goose perhaps?
Small-billed, with steep forehead flattish crown and relatively short, stubby neck. The Canada Goose on the right is probably a smallish example of the form B.c. interior.
When alert, the bill looked tiny compared to the Canada Goose (B.c. interior) associating with it.