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This Adult LBBG-type gull was photographed February 21, 2007 in the Coastal Plain near Houston and Galveston, Texas, Texas; note the following elements that in combination are suggestive of Heuglin's Gull (Larus [?] heuglini):

the large size; it is the size of a small/medium Am. HERG - this strongly indicates that it is a male. the mirror on P10 is fairly small and located well back from the wing tip. no mirror on either P9. subterminal black marks on seven primaries (plus a tiny black notch on P3) black marks in the outermost primary coverts.

It is possible that this is not a fully-adult LBBG, but the black on the bill is not necessarily a sign of immaturity, and Heuglin's Gull often has black on the bill - at least in winter; click here to see a number of such birds at my section on heuglini. In particular compare the wing pattern on the above bird to the heuglini on this page.