On my way home I stopped by NIST to see if I could find the blue Snow Goose. I saw it on the roadside in a group of Canadas. It definitely is a blue phase Snow Goose. (Thanks for the tip!) As far as the rarity of finding a snow goose within a flock of Canadas, the only information I can provide is anecdotal. Someone told me he had seen a blue Snow Goose in a flock of Canada Geese last year. He saw it in Montgomery Village (Gaithersburg, MD). Maybe this goose is the same one as last year's? Andy Rabin Gaithersburg, MD andyrab@wam.umd.edu