The Gray-hooded Gull is a small, hooded gull found in both South America and Africa. The South American race is slightly larger and paler than the African race; it seems highly unlikely that there is currently any gene flow across the Atlantic Ocean, but the two taxa have not diverged enough to be considered different species. In South America, the species is found on and near the Rio de la Plata drainage in Argentina/ Uruguay and the Ecuadorian and Peruvian coast. The species breeds in freshwater wetlands but is often found in flocks along the coast during the nonbreeding season. Gray-hooded Gull can be told apart from the similar Brown-hooded Gull by its gray hood in the breeding season, as well as slightly darker gray back and primary pattern.