Sabine's gull steals eggs from nesting colonies of Arctic terns. The Sabine's gull is a small gull, in length and weighing . The wings are long, thin and pointed with a span of between . The bill, which is black with a yellow tip, is around long. This species is easy to identify through its striking wing pattern. The adult has a pale grey back and wing coverts, black primary flight feathers and white secondaries. The white tail is forked. The male's hood darkens during breeding season. Young birds have a similar tricoloured wing pattern, but the grey is replaced by brown,
Brown-hooded gull of stealing from these birds is 3.5 times higher for the coots than the oystercatchers. They build floating nests among aquatic vegetation at the edges of ponds and lakes. Three to four eggs are usually laid. The black-headed duck has a brood parasite relationship with the brown-hooded gull in which a female will lay an egg in the nest of a brown-hooded gull with the intent of having the host gull incubate the egg instead of herself. Brown-hooded gull The brown-hooded gull ("Chroicocephalus maculipennis") is a species of gull found in Argentina, Brazil, Chile, the Falkland Islands, and Uruguay. Its