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Fig 1) The Sandgates, Maryland bird. St. Mary's County, Maryland. Photo courtesy of George Armistead.
|Fig 2) Note the thick bill, red orbital ring, dull yellow legs, and nearly black mantle. St. Mary's County, Maryland. Photo courtesy of George Armistead.|
|Fig 3) The Colorado bird. This one has an even thicker bill. Note the apical spots are worn off the outer primaries. P6, however, is fresh with a large apical spot. This indicates the bird is midway through primary moult in mid-Sept. This is similar to other northern hemisphere gulls, implying this bird has a northern hemisphere moult cycle. Perhaps it came to Colorado from the Gulf of Mexico? September 17, 2003. Jackson Lake State Park, Morgan County, Colorado. Photo courtesy of Steve Messick.|
|Fig 4) Here's a bird from Chile. Note the black mantle and single white mirror. November 2000. Chile. Photo courtesy of Don DesJardin.|