Saunders's Gull Larus saundersi 

 
adult winter
Yatsu-tidal flat, Chiba Japan January 7th 2002
Compared with Black-headed Gull, the size is smaller,  and its general shape  resembles Ross's Gull  (rounded head, short bill,  and longer wings) . The all-black bill  looks stout. Folded primaries show large white spots. Its relatively long Legs are darker red.
 1st winter
 Yatsu-tidal flat, Chiba Japan
 January 7th 2002
 The folded  primaries lack prominent
  white tips. Dark markings on coverts
  and tertials changed to new gray 
  feather earlier than Black-headed.J
 1st winter
 Yatsu-tidal flat, Chiba Japan
 January 3rd 2002
 Photo by Chisato Yonemochi
 1st winter
 Yatsu-tidal flat, Chiba Japan
 January 3rd 2002
 Photo by Chisato Yonemochi
 1st winter
 Yatsu-tidal flat, Chiba Japan
 January 3rd 2002
 Photo by Chisato Yonemochi
 1st winter
 Yatsu-tidal flat, Chiba Japan
 January 3rd 2002
 Photo by Chisato Yonemochi
 adult or 
 possible 2nd winter
 Kisarazu Chiba Japan
 January 6th 2002
 Photo by Chisato Yonemochi
 adult winter
 Yatsu-tidal flat, Chiba Japan
 January 7th 2002.
 An adult winter bird flying 
 about over Yatsu-tidal flat. 
 January 7th 2002
 adult winter
 Yatsu-tidal flat, Chiba Japan
 January 7th 2002
 a 1st winter bird which 
 caught a crab
 Yatsu-tidal flat, Chiba Japan
 January 7th 2002
 1st winter
 Yatsu-tidal flat, Chiba Japan
 January 7th 2002
 1st winter 
 Yatsu-tidal flat, Chiba Japan
 January 7th 2002
  Note the thinner black tail  band 
  (on average) than Black-headed.
 adult winter
 (right)
 1st winter
 (left)
 Yatsu-tidal flat, Chiba Japan
 January 7th 2002
 a 1st winter with
 an adult or 2nd winter
 Black-headed Gull ( rear)
 and a Grey Plover ( front)
 Yatsu-tidal flat, Chiba Japan
 January 7th 200