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Larus ridibundus
"The common name of this species is inaccurate, as adult black-headed gulls have a chocolate-brown head in summer. In winter, this brown hood retreats and the birds have a largely white head with a dark spot behind the eye. Other distinguishing features include the prominent white leading edge of the upper wing, which is visible from a fair distance, the tern-like slender wings and the reddish coloured bill and legs." Arkive
Algarve, Quinta do Lago, praia do Gigi
"Guincho"
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