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first cycle Glaucous x Glaucous-winged Gull
Figs 1 and 2) It's too early in the season for the primaries to be faded white, as evidenced by the fine subterminal markings, a sign of Glaucous influence. December 22. 1998. Santa Clara County, California. Photos by Mike Rogers.

Figs 3, 4, and 5) This bird appears as a white-winged Glaucous-winged Gull, which is not unusual late in winter, but this bird is still well-marked in the coverts. Note the bill is intermediate between the two species. Petaluma, California. Photo by Steve Hampton.

Fig 6) Another very white, well-patterned gull with a large black bill. Note the patterning has the tan tones often seen in Glaucous Gulls. February 8, 2012. Davis, California. Photo by Steve Hampton.

Fig 7) This bird is closer to the Glaucous end of the spectrum, but the bill suggests some Glaucous-winged influence. February 16, 2013. Petaluma, California. Photo by Steve Hampton.

Fig 8) This bird appears like a finely-patterned Gl-W Gull, but the patterning in the primaries (with the subterminal arrowhead marks) and the patterned tail suggest Glaucous Gull influence. March 4, 2011. Davis, California. Photo by Steve Hampton.

Figs 9 and 10) The head shape seems like Gl-W, but the bill shape favors Glaucous. The bill color is intermediate, and extreme for either in first winter. Because it's March, I'm tempted to say it's a washed-out Gl-W, but this is extreme, and the fine sandy-brown patterning on the coverts and cross-hatching on the scapulars, as well as the white tertials with a few subterm marks, all look very trademark Glaucous to me. The tail shows some paler patterning on the outer halves of the retrices, which is a Glaucous trait. March 14, 1998. Ocean Shores, Washington. Photos by Ryan Shaw.