Can measure 122 cm, its feathers are completely white with the exception of the two first thirds of the neck which is black. Blue-grey beak with red caruncles at base. The feet are light flesh-colored.
Lives in lagoons with abundant cattails, generally near the coast.
Distribution: From the Huasco valley (Atacama) to Tierra del Fuego. Also in the Juan Fernández Archipelago
Habitat: lagoons with abundant reeds, usually near the coast