Ring-billed Gull Larus delawarensis
March 26th 2004 Choshi Chiba Japan
The usual individual. It turned into breeding plumage earlier than Kamchatka Gulls, same as last spring.
Note that 2 Kamchatka Gulls in the background are winter plumage.
Click here to see Kamchatka Gulls on the same date for comparison