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Alternative Names: Kamchatka Gull, Pacific Gull.
L. 27 inches (68.5 cm)
 Breeding Adult
Highly variable. First cycle mostly brown with brownish wing-tips. May have bleached greater coverts. Second cycle similar but with dark slaty-colored mantle feathers. Third cycle similar to adult but with brown smudging on wing coverts and black spots on otherwise white tail.
 Similar Species
The wings and back are slightly darker than those of the Western Gull. Slaty-backed usually shows extended secondaries forming a "skirt." Relatively short primary projection and pot-bellied look. Immature is similar to Great Black-backed Gull, but paler; lacks checkered appearance of that species. Usually distinguished from Herring Gull by brown rather than black wing-tips and relatively plain pattern on greater coverts. May be confused with hybrids between Glaucous-winged Gull and either Herring or Western Gull.
It is a common coastal breeding species in northeastern Asia, wintering southward to Japan, Korea and China. Frequently wanders to the western Alaska shorelines. Now annual in northeastern North America with records in many states.
Forager and a scavenger.
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