Agriornis lividus fortis

This is the largest representative within the Tyrannidae family, boasting an impressive body length of 26 to 31 centimeters. It displays a robust, heavy silhouette characterized by a powerful, blackish bill with a distinct hook at the tip of the upper mandible. The upperparts are predominantly dusky gray to brownish-gray, contrasting with a pale, whitish throat that features neat, dark longitudinal streaks. The breast is pale grayish, transitioning into a warm ochre, cinnamon, or rufous belly and undertail coverts. A key diagnostic feature visible during flight is the tail, which is dark with broad white outer margins and tips on the rectrices. It possesses dark or reddish-brown irises and strong, black legs suited for clutching rugged, exposed perches.

Geographical distribution: This passerine is native to the Southern Cone of South America, with its range divided between Chile and Argentina. In Chile, the nominate subspecies Agriornis lividus lividus occurs continuously from the Atacama region down south to the Brunswick Peninsula in Magallanes. In Argentina, the subspecies Agriornis lividus fortis is distributed along the eastern slopes of the Andes throughout the Argentine Patagonia, stretching from the provinces of Neuquén and Río Negro down to the windswept plains of Tierra del Fuego.

Habitat: It occupies a variety of open and semi-open landscapes, showing a strong preference for arid and semi-arid hillsides covered with xerophytic scrub and high-altitude matorral. It is also commonly observed along the edges of temperate Nothofagus forests, damp grasslands, rocky ravines, rural agricultural zones, and pastures. This species can adapt to various elevations, ranging from sea level up to 2000 meters above sea level, successfully enduring the harsh environmental conditions of cold-temperate and steppe climates.

Feeding: The diet is highly carnivorous and opportunistic, making this species a formidable apex predator among South American flycatchers. It feeds heavily on large invertebrates, such as beetles, orthopterans, and arachnids. Thanks to its robust and hooked bill, it frequently preys upon small vertebrates, including lizards of the genus Liolaemus, small rodents, amphibians, and even the eggs and nestlings of smaller bird species, which it captures by diving swiftly from elevated hunting perches.

Behavior: It is a solitary bird or one that moves in stable territorial pairs during the breeding season. It typically perches conspicuously on the outermost branches of bushes, fence posts, or prominent rock formations, maintaining an upright, vigilant stance. Its flight is strong, direct, and slightly undulating. This species produces a very distinctive, loud, and melancholy whistle, typically heard at dawn or when defending its territory. It is highly territorial and known to aggressively chase away intruders, including much larger birds of prey that venture near.

Nesting: The breeding season takes place during the austral spring and summer, spanning from October to January. The birds construct a bulky, open, cup-shaped nest using twigs, rootlets, lichen, and dry grasses. The inner cup is heavily lined with insulating materials like sheep wool, horsehair, and feathers to protect the clutch from low temperatures. The nest is hidden within thorny shrubs, low thickets, or rocky crevices. The clutch typically consists of 2 to 4 creamy-white eggs, adorned with reddish-brown spots concentrated near the larger end.

Conservation status: It is currently classified as a species of Least Concern (LC) on the IUCN Red List of Threatened Species. Although it does not face immediate global threats thanks to its extensive range and stable population trends, localized populations remain susceptible to habitat degradation, the conversion of native scrublands into agricultural fields, and rapid urbanization, which reduces its natural foraging territories.