Slaty-backed Gull  Larus schistisagus
Oct. 15th 2004 Tamagawa-river Kawasaki Kanagawa Japan



Juv./1st winter


Same individual as above




Juv/1st winter. female-type, small individual


Same individual as above



Juvenile



juv/1w




2nd winter


Same individual as above



3rd to adult winter on the samedate>>
Flight shots of juv-1w on the same date>>