Puna Teal

Characterized by its highly contrasting and elegant plumage, this medium-sized waterfowl measures between 40 and 46 centimeters in length. The most diagnostic morphological feature of this species is its distinct black cap that covers the crown and extends down below the eyes and onto the nape of the neck, sharply contrasting with the pristine creamy-white cheeks and throat. Its bill is long, broad, and displays a striking bright blue coloration, divided by a prominent black line running down the center of the culmen. The body plumage exhibits a delicate pattern of grayish-brown with fine dark barring on the flanks and a more uniform brown back. The wing features a brilliant metallic green speculum bordered by thin white stripes. The legs and feet are lead gray. Sexual dimorphism is virtually non-existent in plumage pattern, though females are often slightly smaller and may present a slightly duller facial coloration.

Geographical distribution: Endemic to the high Andes of South America, its geographical range is concentrated in the altiplano region. It is found in southern Peru, western Bolivia, northern Chile (specifically in the regions of Arica and Parinacota, Tarapacá, and Antofagasta), and northwestern Argentina (in the provinces of Jujuy, Salta, Catamarca, and Tucumán). While largely sedentary across most of its range, some populations may engage in local altitudinal migrations to avoid freezing conditions in the highest lakes during the harsh winter months.

Habitat: Strongly associated with the specialized wetlands of the puna ecoregion, this species typically occurs at elevations ranging from 3,000 to 4,600 meters above sea level. It prefers shallow, alkaline or freshwater high-Andean lakes, brackish lagoons, peat bogs (locally known as bofedales), marshes, and slow-moving rivers. These aquatic environments must provide adequate emergent vegetation, such as reeds and bunchgrasses (Stipa and Festuca), which offer critical shelter and nesting sites.

Feeding: Employing an omnivorous diet, this duck filters food from the shallow water column and muddy substrates. Using the fine, comb-like lamellae on the margins of its bill, it efficiently extracts aquatic seeds, algae, and small organic particles, along with various invertebrates such as mollusks, crustaceans, aquatic insects, and their larvae. Feeding methods include surface-filtering, dabbling, and swimming with its head and neck partially submerged.

Behavior: Primarily observed in pairs, small family groups, or minor flocks, it rarely forms large congregations except during the non-breeding season around highly productive bodies of water. It is known to be a relatively docile and approachable species, showing less wariness toward humans than other Neotropical ducks. Its flight is rapid and direct, showing high maneuverability. Vocalizations are quiet and infrequent; males produce a soft whistle during courtship displays, while females make a soft, raspy quack when alarmed.

Nesting: Breeding activity is closely tied to the seasonal abundance of food and water levels, generally occurring between September and April. The nest is placed on dry ground, closely situated to the water´s edge, and hidden deep within dense vegetation like rushes or bunchgrasses. It consists of a shallow scrape lined with dry grasses, leaves, and a thick layer of dark down feathers plucked from the female´s breast. The clutch typically consists of 5 to 6 cream-colored or pinkish-buff eggs. Incubation lasts between 25 and 27 days and is performed solely by the female. However, the male remains close to the nesting site, assisting in territorial defense and subsequent protection of the precocial ducklings once they hatch.

Conservation status: Categorized as Least Concern (LC) on the IUCN Red List of Threatened Species. Although its global population is considered stable, its specialized high-altitude habitat makes it vulnerable to environmental threats. The main pressures on its population include habitat degradation due to water extraction for mining and agricultural irrigation, climate-induced droughts, and the overgrazing of critical high-altitude wetlands by domestic livestock.