Averla formichiera dalla coda grande

Identificazione

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 is crown 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.

Tassonomia

The large-tailed antshrike shares genus Mackenziaena with the tufted antshrike (M. severa) though there is some doubt about how closely they are related. Both species are monotypic.

Nome scientifico

Mackenziaena leachii

Autorità

(Such, 1825)

Ordine

Procellariformi

Famiglia

Non una specie di uccello valida

Genere

Mackenziaena

Areale e habitat

The large-tailed antshrike's range was long thought to be from eastern Minas Gerais and southern Espirito Santo in Brazil south through eastern Paraguay into northeast Argentina's Misiones Province. However, a 2012 pulication ducumented 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.

Migrazione

Resident species

Comportamento

The large-tailed antshrike is presumed to be a year-round resident throughout its range.<p>The large-tailed antshrike feeds on a variety of large insects and other arthropods; its diet also includes molluscs and small vertebrates including frogs, lizards, snakes, bird eggs and nestlings. It forages singly or in pairs, almost always within about 5 m (15 ft) of the ground in dense bamboo and shrubs. It hops from branch to branch and along the ground, reaching from a perch to glean prey from leaves, stems, and branches. It often drops to the ground to seize prey.<p>Nothing is known about the large-tailed antshrike's breeding biology.<p>The large-tailed antshrike's song is a "hurried, slightly slowing down, at first rising then descending series of about 15 very high, strident 'sweep' notes". Its call is a "downslurred, sharp 'sreee'. Because the species favors dense understorey, it is more often heard than seen.

Conservazione

Tendenza della popolazione

declining