(anser rossii)
The Ross's Goose in Scotland is placed in Category D of the Scottish List which means that it has not yet been accepted that any birds found are of genuine wild origin. The assumption is that any birds will be of a feral origin possibly from escapes. However, most winters the occasional bird can be found always in association with other goose flocks and indeed may well migrate with the 'carrier' flock. So a Ross's Goose found with the Barnacle Geese may well go to Svalbard for the summer and return the following winter. There are certainly a few feral Ross's Geese which seem to frequent locations in England and remain all year.