This gull was photographed on March 17, 1998 in Texas by Martin
Reid. I noted at the time of observation that the bases
to the outermost tail feathers and the central belly were starkly
white. I took eight slide photos of the bird, all of which
are shown here. The original slides are all slightly underexposed,
with sunlight from slightly behind the bird. The scans do
not capture the true detail/contrast of the originals, but I've
tried to adjust the images to best match them (all adjusments
were applied to the whole image, to avoid any subjective changes);
NOTE: all images were prepared using a 17" monitor; viewing
on a smaller monitor will cause the images to appear much darker
than "true", while viewing on a larger monitor will
make them appear much paler than "true":-
image a):