Description wikipedia

The large-tailed antshrike (Mackenziaena leachii) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds". It is found in Argentina, Brazil, Paraguay, and Uruguay. The large-tailed antshrike is a large dark antbird with a long full tail. It is 25 to 26 cm (9.8 to 10 in) long and weighs 58 to 62 g (2.0 to 2.2 oz). The species exhibits significant sexual dimorphism, though both sexes have a moderately long black bill with a hook at the end like true shrikes. Adult males are mostly black with small white spots on their crown, nape, upperparts, and sides. Adult females are mostly brownish black. Their forehead is rufous, their crown is rufous with black edges on its feathers, their upperparts have pale buff spots, and their wings have pale buff bars. Their underparts are thickly spotted with buffy white and their crissum is barred with buffy white. Subadults resemble adult females but their spots are larger and their belly and tail have faint pale bars. The large-tailed antshrike's range was long thought to be from eastern Minas Gerais and southern Espírito Santo in Brazil south through eastern Paraguay into northeast Argentina's Misiones Province. However, a 2012 publication documented a record in northeastern Uruguay, and the South American Classification Committee of the American Ornithological Society accepted the record. The large-tailed antshrike is a bird of the Atlantic Forest. It inhabits the dense understorey of several forest types. In the more northerly part of its range it occurs in humid foothill and montane forest, especially in areas with large stands of bamboo. To the south it prefers somewhat degraded forest including scrub with much bamboo, dry forest, humid and stunted foothill woodlands, and thickets at the edge of taller forest. In elevation it ranges from sea level to about 2,200 m (7,200 ft) and it tends to be at higher elevations in the northern part of its range.