Large, mostly white goose among a large flock of Canada geese with a few Greylags
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It's not unusual for Greylags and Canadian Geese to cross breed but this is not the usual coloration of that mix, perhaps there is some Domestic Goose in it.
Updated entry - I seem to have entered this as Ophrys was entering an ID, so I think his ID is more than likely correct.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
I agree with Chris. It is pretty large, like a domesticated goose, but there look to be elements of Greylag (as you would expect) and Canada in there somewhere... I am not sure that you can get to the bottom of exactly what it is.
Updated entry...I think your comment was about right, Chris!
My Flickr photos...
I think the Latin name for the Domestic Goose is Anser anser anyway, so I agree with your ID.
Makes perfect sense now you mention it - thanks!
Lat/Lng: 53.2576, -1.1452
OS grid ref: SK571737