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Fig 1) This bird has already obtained a clean white head. The head shape and bill size suggest this may be a female. Note the primary extension is much shorter than Iceland Gull. March 3, 2004. Greeley, Colorado. Photo by Bryan Guarente.

Fig 2) The icy blue-gray mantle contrasts strongly with the surrounding California Gulls. March 6, 2013. Davis, California. Photo by Steve Hampton.

Fig 3) An even earlier bird, again with a clean white head. February 10, 2004. Chicago, Illinois. Photo by Kanae Hirabayashi.

Fig 4) The same bird as Figure 3. Note no trace of color in the outer primaries.