Yesterday, I observed 5 of these oddly coloured geese in a mixed flock of Greylag and Canada geese by Lake Roxen, stergtland, Sweden. They were considerably smaller than Canada goose but similar, (or maybe a bit smaller than the Greylag). They mixed with both species but stayed more or less together as a group. I don't recall ever seing this kind of goose before (birder since 1973) so I'm very curious to learn what they are.
A 1600x1000 pixel crop including a Greylag goose can be seen if you follow this link:
http://www.jensbirch.eu/jensbirch/box/Faglar/3_strange%20geese_plus_greylag_100percent_PB156766.JPG
