We spotted this Heermann's Gull (Larus heermanni) on Salmon Creek Beach yesterday, 21 May 2016. It caught my eye because this is early for Heermann's Gulls to appear along the Sonoma Coast. Most don't arrive until mid-late June (after nesting in the Gulf of California).
P.S. For more pictures of this handsome gull, review the post from 5 July 2012.