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Chroicocephalus maculipennis
Spotted in Punta Ballena, Maldonado, Uruguay. I think this is a Brown-hooded Gull (Chroicocephalus maculipennis) in one of its plumages, but I am doubting.
Thanks PedroNicolau. Why do you think it's Larus ridibundus? That bird is not normally seen in Uruguay. I suspect it's the Brown-hooded Gull, which looks very similar to the Black-hooded Gull. However, the Brown-hooded Gull is native to Uruguay.