IMAGES: 1) 1 presumed adult at colony in UK; standing and in flight 2) 1 possible adult the Longport, NJ mystery gull DESCRIPTION: HERRING X LESSER BLACK-BACKED GULL (...) smithsonianus/argenteus x graellsii BILL SHAPE: ... HEAD SHAPE: ... WING EXTENSTION: ... POSTURE/HABITS: ... FIRST WINTER SECOND WINTER THIRD WINTER ADULT WINTER BILL COLOR: ... ... ... ... LEG COLOR: ... ... ... ... IRIS/ORB RING: dark ... ... ... HEAD: ... ... ... ... UNDERPARTS: ... ... ... ... PRIMARIES (folded): ... ... ... ... PRIMARIES (in flight): ... ... ... ... SECONDARIES (in flight): ... ... ... ... TERTIALS: ... ... ... ... GREATER COVERTS: ... ... ... adult gray LESSER & MED COVERTS: ... ... ... adult gray SCAPULARS: ... ... ... ... BACK: ... ... ... ... RUMP: ... ... ... white TAIL: ... ... ... white