Mallards, Ring-billed Gulls, female Hudsonian Godwit, Franklin's Gulls at Lake Overholser, OK; If you use Sibley, this is a tricky ID because of the small illustration of the female Hudsonian.
However, note that the subject lacks the fine pattern of bars on the wings
back and breast that are characteristic of Marbled Godwit. The unpatterned
gray wings are probably the most distinctive feature indicating this is a
female Hudsonian Godwit. Also, the back is blotched rather than barred, there
are no bars on the lower neck, and the bars on the belly are thick and
poorly defined.