See: Birding 26(2):126 for discussion on transitional Franklin's
Gull Paul Lehman says might be confused with Laughing Gull.

I think your discription of the wing would seem to rule out any
worries about a weird transitional Franklin's, but you might
want to check out the article, just to be ahead of the curve
with whichever RBC gets to deal with the report.

--
Mike Patterson
Astoria, OR
celata at pacifier.com

Common species are more common than rare species
--- Dennis Paulson in
_Shorebirds of the PNW_