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This dark-backed gull was present at Brownsville Landfill on March 16, 1999 (photos by Martin Reid), and is probably the bird reported on March 5 as a possible Kelp hybrid. In my opinion the leg color was perfect for Kelp: a peculiar pale greenish-gray (and uniform throughout - unlike a minority of other large gulls that show areas of yellowish-gray and flesh on their legs). The short primary projection also matches Kelp. The mantle was slightly paler than the primaries and I'd estimate that the tone was at the dark end of the LBBGs we see in Texas; also both the legs and bill are very long and thin - with a significantly swollen gonys; the single white mirror would be on the large side for Kelp, and there was a small patch of dark brown spotting on the lower nape.
Thus, I feel it is possibly a Kelp x smithsonianus hybrid - and I arrive at this latter partner because this is the only known interspecific pairing of Kelp (and from fairly close by, in SW Louisiana). Could it be something else? - OF COURSE: this is a GULL! any suggestions/comments would be much appreciated.