Notes: In breeding plumage black hood, dark grey upperparts, tail white,
bill dark reddish, legs reddish black. Bold white split eye-ring. Similar size to
Silver Gull but long angled wings w. mainly black
wing-tips. Bill is longer, thicker, and slightly drooped rather than short & straight as for
smaller Franklin's Gull which also has mainly
white-tipped primaries w. black sub-terminal band. Sexes similar. Non-breeding adult has
rudimentary dark hood. Vagrant from N America.