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Update Dec 11,2003: The first (distant) flight shots added at the bottom.
This adult/near-adult basic Slaty-backed Gull (Larus schistisagus) was photographed December 3 - 9, 2003 at Lake Balmorhea, west Texas:-

This is the first image made available to me; note the following features:

The following images have been subsequently provided by various photographers, with permission; note the following extra points:

Added Dec 11,2003: Although distant and fuzzy, these images show a classic SBGU underwing:

Note on these Japanese gulls (click here) that the underside of P10 is not always contrastingly dark, and also note how the white pattern near the tips of the outer primaries (the so-called"string of pearls") is much more visible from below than from above on many SBGUs.