just spent an hour at castle island, which was quite busy, lots of mud there atmo.
2 sub race canada geese there amoungst 100 flock of `regular` types. WIll try and work out what they were for the little info online: the white band on face was narrow, with more browny plumage below the black neck, one birds had yellow ring around the eye, about 10% smaller than the other birds, also were nervous or my prescence.
3 little gulls, 1 black tailed godwit, other birds of note.
update: possibly Taverner's Canada Goose, best i can find that matches.I think the white on the face was even narrower than pic below:
http://www.camacdonald.com/birding/Hotspots/CanadaGoose.JPG
OFcourse, highly likely to be `plastic` or semi feral. worth a pic though if any one with a camera has some free time....