Description: Fiofío of approximately 15 cm, being one of the most characteristic and abundant representatives of the genus in southern South America. It has an olive-gray back and whitish-gray underparts, with a slight olive tinge on the flanks. It has a very conspicuous crest with a characteristic central white patch that is usually visible, a feature that can often be appreciated even from a distance. The wings show two well-marked whitish wing bands. The bill is thin and relatively short, dark gray, with a pinkish or yellowish base of the mandible. Sexes are similar. Juveniles are browner and show buffy wing bars.
It can be confused especially outside the breeding season with the Short-billed Elaenia (Elaenia parvirostris). However, the White-crested Elaenia has a more developed crest, with the central white patch usually visible, a longer primary projection, and more pointed wings, in addition to always having two well-defined wing bands. The Short-billed Elaenia usually shows a faint third wing bar, a less obvious crest, and a somewhat more compact general appearance. The voice is one of the best identification criteria, since the characteristic repetitive whistle of the White-crested Elaenia is unmistakable in its breeding grounds.
Geographical distribution: It is widely distributed throughout South America. There are resident populations in the Andes from southwestern Colombia to Peru and Bolivia, while the austral subspecies Elaenia albiceps chilensis breeds from southern Bolivia and northwestern Argentina southward, occupying much of Chile and Argentina down to Tierra del Fuego and the Cape Horn archipelago. There are also accidental records in the Falkland Islands and other subantarctic islands.
In Argentina, it has two main breeding cores. On one hand, the southern populations occupy the Patagonian Andean Forest during spring and summer, where it is one of the most characteristic and abundant birds of these environments. These southern populations, including those of the Argentine Patagonian Andean Forest and a large part of the breeding populations of Chile, are almost completely migratory. After breeding, they leave their nesting areas and make extensive movements northward through different migratory routes. Part of the populations seems to follow Andean corridors, reaching wintering areas in Bolivia, Peru, Ecuador, and even Colombia, while others use eastern and lowland routes, crossing central and northern Argentina, Paraguay, and Uruguay, to reach wintering areas in southern, central, and northeastern Brazil. During these movements, they use a wide variety of arboreal environments, including the Paranaense Forest, the riparian forests of the Paraná and Uruguay river basins, the Espinal, and various forested environments of central and northern Argentina. Consequently, during migration, it can be observed in practically any wooded environment in the north and center of the country, including gallery forests, Chaco forests, parks, gardens, and rural groves. In Buenos Aires and other provinces of central Argentina, it is one of the most regular and predictable southern migrants, recorded annually in very similar periods.
On the other hand, there are breeding populations in the Yungas and probably in the Central Sierras. In the Yungas, it occurs between August and May, breeding mainly in montane forests, secondary forests, and woodlands of intermontane valleys. These populations seem to present a migratory pattern different from that of the Patagonian populations, making less extensive regional and altitudinal movements. Some evidence suggests movements toward the Pantanal and returns through the dry forests of the western Chaco, although these patterns still require further study. The populations of the Central Sierras are also thought to be partially migratory, though their movements remain poorly known.
Environment: It breeds mainly in the Patagonian Andean Forest and the Yungas, ranging from sea level up to 3,500 m a.s.l. In Patagonia, it occupies Nothofagus and Araucaria forests, forest edges, young successional stands, and shrubby environments, while in northwestern Argentina, it inhabits montane forests, secondary forests, and woodlands of valleys and ravines. During migration, it uses virtually any wooded environment.
Feeding: Omnivorous. It mainly consumes arthropods, flying insects, berries, and various fruits obtained from trees and shrubs. It may occasionally feed on nectar, hovering briefly in front of flowers. It frequently joins mixed-species flocks during the non-breeding period.
Behavior: Usually solitary, in pairs, or in small groups. It frequently joins mixed-species flocks. It moves actively through the foliage and often makes short flights to capture insects or take fruit. During migration, it can gather in large groups, occasionally forming concentrations of dozens or even hundreds of individuals. Particularly vocal and territorial during breeding, its whistle being one of the most characteristic voices of the Patagonian forests in spring and summer, where it can be heard virtually continuously throughout the day. It is curious and relatively trusting.
Reproduction: Nests between spring and summer. It builds a small cup-shaped nest made of plant fibers, mosses, lichens, and small twigs, lined internally with feathers or soft plant material. It is usually placed in the fork of shrubs or trees, though exceptionally it may use cavities. The clutch consists of two to three whitish eggs with small reddish spots.
Conservation category: Species categorized as Not Threatened (NA) at the national level and as Least Concern (LC) at the international level. Common and widely distributed throughout much of South America, it also shows remarkable tolerance to modified environments and secondary forests.
Autor de esta compilación: María Belén Dri y Diego Carús – 13/07/2026