1st winter/summer
Slaty-backed Gulls Larus schistisagus
March 15th 2005 Choshi Chiba Japn

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Same individual as the left bird in the above 2 photos

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In the individual in front, replaced feathers seem to be restricted to the upper scapulars/mantle.


Same individual as the front bird in the above photo.

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Note the typical brownish primaries.

Same individual as above

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3 Slaty-backed Gulls


4 Slaty-backed Gulls
Note their variable brownish (not blackish) primaries .


One Glaucous-winged Gull among Slaty-backed Gulls.
Glaucous-winged Gulls tend to look obviously grayish and uniform than Slaty-backed Gulls


2 Slaty-backed Gulls, and 1 Glaucous-winged Gull (right).


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