Black-faced Ibis

Characterized by a robust body measuring between 28 and 30 inches (71 to 76 centimeters) in length, this species displays a highly contrasting plumage of grey, buff, and black tones. The head, neck, and upper chest are washed in a warm buffish-cinnamon color, while the mantle and back are predominantly silvery-grey. Its abdomen, flanks, undertail coverts, and primary wing feathers are a striking, deep coal-black. A prominent feature is the patch of bare black skin surrounding the eyes and extending to the base of its long, slender, and strongly decurved bill. Its legs are relatively short and display a vibrant pinkish-red hue. Unlike some closely related taxa, it lacks a white throat patch, which serves as a key diagnostic feature in field identification.

Geographical distribution: Occurs primarily in the southern cone of South America, with a breeding range stretching across Chile (from the Antofagasta region south to Tierra del Fuego) and the Argentine Patagonia. During the austral winter, southern populations migrate northward to central Argentina, Uruguay, and occasionally the southernmost state of Brazil, Rio Grande do Sul. Additionally, there is a disjunct, resident population along the arid Pacific coast of Peru, where they are closely associated with river valleys, lomas, and coastal wetlands.

Habitat: Prefers open landscapes and flat terrains, including wet grasslands, agricultural pastures, temperate meadows, marshes, and the margins of shallow lakes. While mostly found in lowland plains, in the Andean pre-cordillera it can adapt to intermontane valleys and open slopes up to 8,200 feet (2,500 meters) above sea level. It strictly avoids dense forests and heavily wooded areas, where its terrestrial foraging style and flight maneuvers would be compromised.

Feeding: Functions as an opportunistic carnivore with a highly varied diet. It utilizes its sensitive, curved bill to probe deeply into moist soil, mud, and short turf, locating prey by touch. Its primary food source consists of terrestrial invertebrates, such as earthworms, beetles, larvae, and orthopterans. It also hunts visually on the surface, opportunistically eating small vertebrates like amphibians, lizards, small rodents, and occasionally the nestlings of ground-nesting birds.

Behavior: Highly gregarious in nature, this bird is typically observed in pairs or active flocks that can range from a dozen to over a hundred individuals during the non-breeding season. It is well known for its loud, metallic, and resonant vocalizations, often described as a clanging "cank-cank-cank", which flock members emit in unison during flight or when roosting to establish contact and defend temporary territories. It spends most of the daylight hours walking deliberately on the ground in search of food and roosts communally at night on high branches, rocky cliffs, or tall utility poles.

Nesting: Commences its breeding cycle between September and October, depending on the latitude of the breeding colony. It exhibits a strong colonial nesting habit, frequently establishing colonies alongside other waterbirds. Nests are built on high cliff ledges, tall trees, or deep within reed beds in inaccessible swamps. The nest structure is a bulky platform constructed of sticks, reeds, and grass, lined internally with softer vegetation. A typical clutch consists of two to three eggs, which are greenish-white with brown speckling. Both parents share incubation duties for roughly 28 days, and both actively feed and protect the dark-downed chicks until they fledge.

Conservation status: Classified as Least Concern (LC) on the IUCN Red List of Threatened Species. Overall, the population is considered stable, as the species has benefited to some extent from deforestation and agricultural expansion, which create the open pastures it favors for foraging. However, localized coastal populations in the northern part of its range face threats from wetland drainage, pollution, and coastal development.