This guy has a suite of characters that could lead
the uninitiated to think this he
is more than he is. The eye is ivory white. The orbital
ring is pinkish. There's a
dark gray smudge of feathering through the feathers around the eye.
The white
skirts are longish and there's a lot of black in the tail. There
is also small mirrors
on the under side of the outer most primaries.
So, one might be tempted to call is a Slaty-backed Gull....