Patagonian ground-tyrant measuring approximately 16–18 cm in length. It has an overall dark brownish-gray coloration, with the forehead, lores, and area around the eye notably blackish, forming a distinctive facial mask. The crown usually shows a faint, inconspicuous chestnut tinge. The wings are dark, with fine pale edges, and the tail is blackish, with the outer feathers partially white. The underparts are grayish, becoming whitish on the belly and undertail coverts. The iris is dark, and the bill and legs are black. The sexes are similar. Juveniles have a paler head and wing coverts with buff-colored edges. It may be confused with juveniles of the Cinnamon Ground-Tyrant (Muscisaxicola capistratus), which do not yet show the characteristic cinnamon coloration of the head.
Geographic distribution: A species distributed across southern Chile and Argentina, from Neuquén and Río Negro south to Tierra del Fuego and its nearby islands. Two subspecies are recognized: mentalis, corresponding to the continental populations, and maclovianus, endemic to the Falkland Islands.
The continental populations are migratory. Breeding birds from southern Argentina move northward during winter to central and northern parts of the country, regularly reaching Córdoba, Buenos Aires, Entre Ríos, Santa Fe, and Uruguay, and occasionally southern Brazil. Wintering individuals are also recorded in Mendoza, while sporadic records exist from other provinces of Cuyo and northwestern Argentina. Chilean populations, in contrast, migrate mainly northward along the Pacific slope, reaching as far as Peru.
It occurs from sea level to approximately 2,500 m above sea level.
Habitat: During the breeding season, it primarily inhabits open grasslands, shrubby steppes, wet meadows, ravines, and ecotones between the Patagonian steppe and Andean-Patagonian forests. It also uses high-Andean environments and rocky slopes. In winter, it occupies a wide variety of open habitats, including grasslands, cultivated fields, beaches, coastal environments, wetlands, steppes, and urbanized areas with expanses of short grass, being frequent along the shores of the Río de la Plata.
Diet: It feeds primarily on insects and other small arthropods that it captures on the ground, moving through short runs and small hops before stopping abruptly to capture its prey. It occasionally makes brief pursuit flights.
Behavior: A predominantly terrestrial species that is relatively confiding and restless in its movements. It is usually observed alone or in pairs during the breeding season, although in winter it often forms groups and loose flocks, which may occasionally include numerous birds. It frequently perches on rocks, low shrubs, posts, or fences, from where it inspects the ground before descending. It moves through short runs and small hops, stopping abruptly to observe its surroundings while repeatedly wagging its tail up and down. It is generally a quiet species; its voice consists of brief, high-pitched, subdued calls, as well as series of harsh or squeaky notes during the breeding season. The male performs characteristic breeding displays, rising into flight and subsequently descending to the ground, where it displays its wings in front of the female.
Nesting: It builds a cup-shaped nest made of grasses, plant fibers, feathers, and other soft materials. It generally places the nest in cavities or among rocks. The clutch consists of two to three eggs.
Conservation status: The species is categorized as Not Threatened (NA) at the national level and as Least Concern (LC) at the international level. It is common throughout much of its range and, although some populations may be locally affected by habitat modifications, it faces no significant known threats.
Author of this compilation: María Belén Dri and Diego Carús – 21/07/2026