Juvenile/1st winter
Slaty-backed
Gull Larus
schistisagus
November 1st 2006 Choshi Chiba Japan
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Presumed female-type
Slaty-backed Gull
This looked very like a Thayer's
Gull at first glance. But
it didn't seem so clearly small or short-legged.
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Unfortunately it flew away soon.