This presumed first-basic smithsonianus Herring Gull was photographed at Arlington
Landfill, Tarrant County, Texas on November 23, 1999 by Martin
Reid; it exhibits a number of features associated with L. a.
vegae:
Note: the bill shape; sparse dark markings on the undertail coverts;
longish wings; wing coverts and tertials heavily-marked with white:
The tail pattern is notable in that there seems to be a very large
white base to the outer three retrices, with few dark markings
in this white area:
compare the tail pattern to that of the Ring-billed Gull:
Note the rather sparsely-marked rump, very white outer tetrices,
and rather plain outer greater coverts:
