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This presumed first-basic smithsonianus Herring Gull was photographed at Bolivar Flats, Texas on November 22, 1999. I feel it is an advanced-molt first-basic rather than a 2nd-basic that mimics a first-basic, because of the retained juvenile lower tertials and (on the bottom image) juvenile lowermost subscapular. Assuming for the moment that it is indeed a first-basic, its state of molt is unusual in that a number of wing coverts plus the upper tertials have already been replaced by November of its first year. It appears (from this bird and a few other examples at my web site) that smith. HERGs can sometimes exhibit similar molt patterns to Yellow-legged Gull, and thus this feature needs to be used with great caution to support a 1B YLGU identification: