Hi tweets, those of you interested in gulls might want to take a peek at
the August 1996 _Condor_ and check out:

Bell, D.A. 1996. Genetic differentiation, geographic variation and
hybridization in gulls of the _Larus glaucescens-occidentalis_ complex.
Condor 98: 527-546.

It's a very detailed examination of specimens of Glaucous-winged and
Western Gulls (and all the hybrids between) collected from Buldir I. (in
the Aleutians) to Los Coronados I. in Baja California. Several physical
and genetic characters are examined, and the author discusses the current
status of the hybrid zone and the post-glacial history of these two
species. A fascinating read.

My apologies to fellow COS for whom this is redundant info.

-------------
Michael R. Smith
Univ. of Washington, Seattle
whimbrel at u.washington.edu
http://salmo.cqs.washington.edu/~wagap/mike/mike.html