Shear-tailed Grey Tyrant

Characterized by an exceptionally graceful and distinct silhouette, this medium-sized tyrant flycatcher measures approximately 22 to 24 cm in total length, a substantial portion of which is represented by its remarkably elongated and deeply forked tail. The plumage is dominated by a uniform, muted slate-gray or brownish-gray coloration across the mantle, crown, and underparts, becoming slightly paler on the throat and center of the belly. The wings and tail feathers show darker, sooty-black tones. The most diagnostic morphological feature is the outermost pair of rectrices, which extend dramatically beyond the central tail feathers to create an unmistakable scissor-like profile. It possesses a short, straight, black bill flanked by prominent rictal bristles, dark brown irises, and slender, blackish legs adapted for perching on exposed vantages. Juveniles resemble adults in general body color, though their rectrices are visibly shorter and their wing coverts often present faint buffy fringes.

Geographical distribution: Restricted to the humid subtropical and tropical zones of eastern South America, this taxon is heavily linked to the endemic corridor of the Atlantic Forest. It occurs primarily across southeastern and southern Brazil, spanning from the highlands of Bahia and Minas Gerais southwards to Rio Grande do Sul. Its range extends southwestward into eastern Paraguay and reaches an extreme southern limit in the northeastern sector of Argentina, specifically in the interior serranías and river valleys of the Misiones province.

Habitat: Found predominantly in humid montane forests, cloud forest edges, secondary woodland clearings, and steep hillsides. It exhibits a high affinity for broken topography such as ravines, granite cliffs, rocky outcrops, and fast-flowing riparian streams flanked by dense vegetation. While it can occasionally be detected at lower elevations, its core altitudinal distribution ranges between 800 and 2200 meters above sea level, occasionally performing minor elevational movements toward warmer slopes during severe winter cold fronts.

Feeding: Operating as a specialized aerial insectivore, it relies primarily on flying insects captured through active sallying maneuvers. Its diet comprises adult hymenopterans (such as flying ants and wasps), dipterans, lepidopterans, odonates, and coleopterans. When winged arthropod activity decreases due to adverse weather or seasonal fluctuations, it occasionally supplements its nutritional intake with small wild berries and drupes collected from subcanopy shrubs.

Behavior: Highly conspicuous in its habits, it spends extensive periods stationed atop high, exposed snags, dead canopy branches, and utility wires. These vantage points serve as hunting perches from which it surveys the surrounding airspace; upon sighting an insect, it launches into vigorous, acrobatic sorties, utilizing its long, outer tail feathers as a dynamic rudder for rapid aerial braking and turning before looping back to the same perch. It is typically encountered individually, in mated pairs, or in small family bands. Vocal communication consists of thin, high-pitched, metallic trills and sharp call notes delivered during territorial disputes or pair coordination.

Nesting: The breeding season takes place during the austral spring and summer, spanning from October to January. The nest is a tidy, sturdy open cup composed of bryophytes, fungal filaments, fine rootlets, and desiccated plant fibers, externally bound with silk cobwebs and camouflaged with lichens. Unlike many related tyrants that build solely in tree foliage, it frequently selects secure niches on rock faces, moist cliff ledges, or sheltered fissures near cascades and rushing streams, as well as sturdy forks on mossy branches. The female typically lays 2 to 3 eggs, which have a cream or pale buff base color decorated with reddish-brown speckles concentrated at the larger end. Both parents attend to the chicks, vigorously defending the immediate nesting territory against encroaching avian predators until the fledglings achieve flight proficiency.

Conservation status: Categorized as Least Concern (LC) on the IUCN Red List of Threatened Species. Although its global population is considered stable and spans several protected montane reserves within the Brazilian coastal ranges, local subpopulations in fragmented areas—such as in Paraguay and northeastern Argentina—face pressure from habitat degradation. The historical deforestation of the Atlantic Forest, construction of road networks through mountainous areas, and degradation of riparian corridors represent continuing concerns for the long-term integrity of its native environment.