I Is an Imperial-Beaver
Not common in England; when scored in this country are almost invariably migrants.
These amusing specimens are, curiously enough, commoner in winter-coat than in ordinary plumage.
There are no tricks about scoring an Imperial. Any specimen with moustache and a growth beneath the lower lip, of which the parent area does not extend to the lower edge of the chin, is an Imperial.
Score three points for a Full-Black; one point for a White.