If you take yourself off to Hall Place, you will see this unusual visitor that has been hanging around along the river for a couple of weeks now. It's called a Barnacle Goose and while not a rare bird by any means, you wouldn't normally expect to see one in South-east London.
They usually live in the Arctic, especially Greenland where they nest in large numbers. In the Winter, they head further South but usually only as far as the North-west corner of Scotland and the West of Ireland.
Similar in colour to the much more common Canada Goose, you might easily mistake it for one if you don't look carefully but it's a much smaller bird than the Canada Goose and has a distinctive black front.