I agree with Clive and Bob about the goose Sherry photographed.  The bill shape is completely wrong for either Cackling or Richardson's Goose.  My guess is the bird is small Canada Goose standing next to a giant feral Canada.  Oddly enough, this same discussion was had during the week the small race Canada was observed at Centennial.  From the descriptions that both Kurt Schwartz and I gave of the bird we saw, it is obviously different than the bird in Sherry's photograph.  The sightings and discussion are in the archives:

http://home.ease.lsoft.com/scripts/wa.exe?A1=ind0403a&L=mdosprey

Matt Hafner
Bel Air, MD