Characterization: A large species measuring about 125 cm in length and 180 cm in wingspan. It has a light gray uniform plumage, a yellow beak and black feathers on the top of its head and in some areas of the wing and of the white neck.

Distribution: It may be found throughout the country and also in Chile and Argentina.

Habitat: Edge of lakes, rivers, creeks, and in floodplains.

Habits: A diurnal, aquatic, and solitary species. It stands turning its wings up horizontally, an attitude that likely serves to regulate its body temperature.

Diet: Carnivorous, feeding on small invertebrates.

Breeding: This bird lays 1-2 eggs in a nest built on treetops. Breeding usually comes at the beginning or end of the dry season, when food for waterfowl is usually more plentiful.

In the UFRA area: This bird species was only seen 8 times. It is considered infrequent in these areas. It was seen in wetlands with herbaceous plants, in native forests, and in drainage ditches. Its preference within these habitats was wetlands with herbaceous plants.