Slaty-backed or Thayer's?
Smallest female 1st-winter Slaty-backed Gull Larus schistisagus or Thayer's Gull Larus thayeri?
Sakawagwa-river Odawara Knagawa Japan, December 30th 2000.
(I guess these birds are possibly Slaty-backed Gull.)


Smallest female 1st-winter Slaty-backed Gull Larus schistisagusor Thayer's Gull Larus thayeri ?
Sakawagwa-river Odawara Knagawa Japan, February 26th 2001.


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