Adult Eastern Caspian Gull (Larus cachinnans
cachinnans)(left) with adult barabensis gull(right),
photographed by Martin Reid in Bahrain, early March 1999. Note
the differences in head shape, and bill shape and color; also
note the sizeable black tip to P10 on the Caspian Gull that suggests
nominate cachinnans (as does the relative mantle tone):