Here are some comparison photos of Gulls courtesy of Jeff Poklen. Click on each picture for a larger version.
First Winter Thayer's Gull - Monterey Bay, October 2001
vs
First Winter Glaucous-winged Gull - Monterey Bay, December 2001
First Winter Thayer's Gull - Monterey Bay, November 1997
First Winter Glaucous-winged Gull - Monterey Bay, October 1996
Presumed Glaucous-winged X Western Gull hybrid (L) with Thayer's Gull (R)
Both Adult Basic, Rio Del Mar, November 2004
3 Adult Basic Gulls, from top to bottom: Western, Thayer's, Glaucous-winged
2 Adult Basic Gulls, Herring (foreground) and Thayer's
More of Jeff Poklen's gull pictures
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