First winter Glaucous-winged Gull Larus glaucescens
Choshi, Chiba, Japan, April 7th 2001.
Some first summer Slaty-backed gulls are misleading to this species.
But, Glaucous-winged shows more uniform grey-brown
often mixed with slightly purple or wine-colored  tone.
Slaty-backed usually shows browner, patched impression.


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