A dark-mantled Herring-type Gull
Herring Cove Beach, Provincetown, Massachusetts
16 November 2002

Aside from the obviously darker mantle, this bird seemed Herring Gull-like in every other respect, though rain and wind made viewing (and photography) difficult and I was unable to determine subtle features such as color of the eye ring or the primary pattern.

Images digiscoped by Blair Nikula with a Coolpix 995 and a Leica Televid scope.