Ichthyaetus melanocephalus
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Do not handle dead or sick gulls with bare hands; gulls can carry avian influenza.
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Adult wingtips carry no black at all, so the wings look entirely white in flight, unlike the black-tipped black-headed gull
Summer hood is genuinely velvet black and extends down onto the nape
Thick broken white crescents above and below the eye, standing out on the black hood
Bill heavy and red with a black subterminal band and yellow tip, versus the slim plain dark-red bill of black-headed gull
In winter retains a broad dark mask from eye to nape, far larger than the single spot of black-headed gull