Grey-headed Gull (Larus cirrocephalus)
(aka Chroicocephalus cirrocephalus Gray-hooded Gull)
Grey-headed Gull, near Uruguaiana, Rio Grande do Sul, Brazil, August 2004 - click for larger image near Uruguaiana, Rio Grande do Sul, Brazil

Grey-headed Gull is distributed in Ecuador and Peru as well as Brazil and Argentina. Another sub-species is found in sub-Saharan Africa.

I include this rather poor photo (I was actually trying to photograph the Great Grebe Podiceps major at the top of the image) because Belton says that this gull is rare in Rio Grande do Sul mentioning only 5 records. He also suggests that it may be more common than this given the difficulty of distinguishing it at rest from Brown-hooded Gull L. maculipennis. In flight it should be easier to identify and here you can see the smallish white "windows" on the black primary tips. The Brown-hooded Gull has more extensive white on the primaries with small black tips on all but the outermost primaries.

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