Southern Screamer

This is a massive and structurally robust avian species that superficially resembles a cross between a turkey and a large goose, reaching a total body length of 31 to 37 inches and weighing between 6.6 and 9.9 pounds. Its plumage is predominantly light gray to brownish-gray, distinguished by a prominent, narrow black collar around its neck, which is bordered by a soft ring of white down. The facial area features a striking patch of bare red skin surrounding the dark eyes, contrasting sharply with its short, downward-curving, gray bill. It is supported by thick, strong, bright pink legs with large feet that have only vestigial webbing at the base of the toes. A highly diagnostic anatomical feature is the presence of two sharp bony spurs located on the carpal joint of each wing, measuring up to 1.6 inches in length, which serve as formidable defensive weapons against predators and rivals.

Geographical distribution: This taxon is native to the lowland regions of southern South America, with a distribution range that encompasses northern and central Argentina, the southern and southwestern territories of Brazil (most notably the Pantanal and Rio Grande do Sul states), throughout the entirety of Uruguay, across most of Paraguay, and extending into the eastern plains of Bolivia.

Habitat: It primarily frequents low-altitude freshwater wetland ecosystems, showing a strong preference for marshes, swamps, flooded savannas, shallow lagoons, muddy riverbanks, and waterlogged pastures. While heavily tied to aquatic environments, it is frequently observed walking and foraging in adjacent dry grasslands, strictly avoiding dense, closed-canopy forests and high-elevation mountain ranges.

Feeding: It maintains a strictly herbivorous diet, feeding on a wide variety of succulent leaves, stems, seeds, and roots of both aquatic and terrestrial plants, which it grazes from the ground or plucks from shallow waters. On rare occasions, especially during the breeding season, it may consume small terrestrial invertebrates such as beetles and snails to provide essential protein for its fast-growing offspring.

Behavior: It is widely renowned for its incredibly powerful and resonant vocalizations, producing a two-syllable "cha-ha" call that can be heard up to two miles away, serving as a loud alarm system for both its consorts and other local wildlife. It is a highly monogamous species, establishing lifelong pair bonds; however, outside the nesting season, it exhibits gregarious behavior, gathering in massive communal flocks of hundreds of individuals to forage and roost safely. Despite its heavy-bodied appearance, it is an outstanding flier, utilizing warm thermal updrafts to soar to immense heights where it can glide effortlessly for prolonged periods.

Nesting: The reproductive cycle begins with the construction of a bulky, floating platform of vegetation, which is built jointly by both partners in shallow water or among dense reeds using twigs, reeds, and decayed aquatic plants. The female typically deposits a clutch of 2 to 7 cream-colored eggs, which are diligently incubated by both parents for a period of 43 to 46 days. The hatchlings are highly nidifugous, emerging covered in a thick layer of yellowish-green down that enables them to leave the nest and swim proficiently alongside their parents within hours of hatching.

Conservation status: It is currently classified as a species of Least Concern (LC) on the IUCN Red List, as its global population remains large, stable, and widely distributed throughout its native range. Nevertheless, localized populations face persistent threats from anthropogenic activities, such as the drainage of wetlands for agricultural conversion, cattle ranching expansion, and sporadic hunting pressures in certain parts of its distribution.