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Glaucous-winged x
Western Gull hybrid
Fig 1) Note the smudged, not streaked head, typical of Glaucous-winged Gull, as well as the pale yellow bill with dark mark. The rest of this bird (wings and mantle) is fairly typical of Western Gull. Redding, CA. December 2003. Photo courtesy of Ray Bruun, copyright 2003.

Fig 2) This is a rather unusual one. It has the bright bill of a Western Gull, as well as blackish primary tips and a reasonably dark mantle, but the extensive head smudging of a Glaucous-winged Gull. photo courtesy of Don DesJardin, copyright 1998

These wings all show a "string of pearls" to some degree, which may be rather common for this hybrid.

Fig 3) January 25, 1985. Columbia River mouth, Oregon. Specimen WFB2497 at the University of California at Davis. Photo courtesy of Thomas Cahill.

Fig 4) These wings come from the Burke Museum, University of Washington. Photo courtesy of Steve Hampton.

Top: March 6, 1999. Whidbey Island, Washington. Specimen 66273.
Middle: January 26, 1990. Neah Bay, Washington. Specimen 58871.
Bottom: December 8, 2005. Bremerton, Washington. Specimen 88628.