British Wildlife Wiki
Richardson's Goose

Cackling Goose ~ Very Similar to Canada Goose, but smaller. Slimbridge ~

The Cackling Goose (Branta hutchinsii), also known as Richardson's Goose has only recently been split from the Canada goose (b. canadensis).

A rare vagrant to Britain, this species is originally found in Canada. Compared to canada geese it is much smaller and more compact, with a shorter head and a shorter neck. Similar in size and structure to the Barnacle Goose.