The photo at the top of the page is an American Herring Gull in Winter plumage. The only real difference is the soft gray spots on the head and neck; the rest of the year that area is pure white.
So why would anyone want a gull decoy? Hunters add them to their spreads as confidence birds to help bring in the ducks they are really after. Carvers like them because gull patterns aren't easy to come by, and this one has a profusion of detail. A large plan, measuring 24 x 36, it can be used for a hunting decoy or a decorative piece.
This is from the plan, and it's a lifesize gull, so it's large, and one of our most detailed plans.