Thayer's/Iceland Gull Taxonomy,a short discussion.
note the white background with grayish brown speckling
on mantle, back and wing coverts. The tertials have a solid base
with speckling on tip area. The primaries are the same grayish
brown on the outer webs on the upper wing, while bleached white on
the under wing. The tail band is bordered by a pale tip and inner
speckling. The eye is surrounded with a dark smudge. The
underparts are uniformly gray and the underwing has a 2-tone