Slaty-backed Gull: pale end of the variation

• Thayer's Gull, adult, California (8)
• Slaty-backed Gull: pale end of the variation (22)
• Hybrids with Slaty-backed Gull (30)
• In Box (0)
• (sub)adult smithsonianus (21)
• Common Swifts from Armenia (breeding birds) (38)
• taimyrensis types from Japan (84)
• Icelandic Redwings (11)
• 2nd cycle "Viking Gulls" - dark types (10)
• third cycle American Herring Gull (6)
• first cycle American Herring Gull (5)
• first cycle Slaty-backed Gulls (dark) (9)
• European Herring Gulls in North America (0)
• 2003 (5)
• 2013 (6)
• Armenian Gull (7)
• first-cycle California Gulls (17)
• "Eastern Black Kites" types (5)
• first-cycle Slaty-backed Gulls with pale tail (9)
• small Ring-billed Gulls (5)
• 1st-cycle Vega Gull (3)
• Lesser Black-backed Gull (0)
• 1-2c Lesser Black-backed Gull with pale lozenges on inner primaries (6)
• 1st-2nd cycle (7)
• kelp_gull (0)
• other_stuff (1)
• second cycle American Herring Gull (0)
• Choshi, Japan - March 2012 (10)
• Tail patterns of wagtails (4)
• simrishamn_aug22 (30)
• thayersgulls_japan (18)
• Kelp Gull (0)
• Kelp Gull (15)