Cerchiatore di alberi dalla calotta striata

Identificazione

The streak-capped treehunter is 21 to 23 cm (8.3 to 9.1 in) long and weighs 61 to 65 g (2.2 to 2.3 oz). It is one of the larger members of its genus and has the least amount of streaking. The sexes have the same plumage. Adults of the nominate subspecies T. v. virgaticeps have a mostly blackish-brown face with buff streaks and a tawny-buff malar area. Their lores are grizzled blackish brown and grayish buff. Their crown is blackish brown with dull buff spots on the forehead that become streaks on the crown itself. They have an indistinct dark brown collar with faint buff streaks. Their back is rich dark brown with a few buff streaks on its upper part; the back color blends to a slightly redder rump and reddish brown uppertail coverts. Their wings are rich rufescent brown and their tail dark chestnut-brown. Their throat is tawny-buff with dark feather borders that give a streaked appearance that widens as it extends onto the upper breast and then narrows again. The rest of their breast and their belly are rich rufescent brown, their flanks darker, and their undertail coverts dark reddish brown. Their iris is dark brown, their bill black, and their legs and feet greenish gray to blackish. Juveniles have an almost unstreaked throat.<p>Subspecies T. v. sumaco's crown streaks continue onto its nape; its bill is much shorter than the nominate's and its wing coverts, flight feathers, and underparts are less rufous. T. v. sclateri has a more olive (less rufous) back and is paler and less rufous on the rump than the nominate. T. v. magdalenae has slightly less olive upperparts than sclateri, with a shorter bill, less obvious throat markings, and brighter more golden underparts. T. v. klagesi has a grayer crown with more conspicuous streaks than the nominate, with a much shorter bill, a slightly paler back, a lighter rufuous rump and tail, and a throat more heavily marked with blackish. T. v. tachirensis has a more brownish back than kalgesi, with a darker and less reddish rump and uppertail coverts, darker and more ochraceous underparts, and a dusky wash on the breast.

Tassonomia

The streak-capped treehunter has these six subspecies:<p>These subspecies are open to some dispute. Some of them apparently intergrade, and the subspecies in Colombia and Ecuador are "in need of re-evaluation".

Nome scientifico

Thripadectes virgaticeps

Autorità

Lawrence, 1874

Ordine

Passeriformi

Famiglia

Furnariidae

Genere

Thripadectes

Areale e habitat

The streak-capped treehunter has a disjunct distribution. The subspecies are found thus:<p>The streak-capped treehunter mostly inhabits montane evergreen forest in the subtropical zone, though it also occurs locally in secondary forest. It tends to stay in the undergrowth. In elevation it mostly ranges from 1,300 to 2,100 m (4,300 to 6,900 ft). In Colombia it occurs as low as 1,200 m (3,900 ft) and as high as 2,500 m (8,200 ft).

Migrazione

Resident species

Comportamento

The streak-capped treehunter is a year-round resident throughout its range.<p>The streak-capped treehunter's diet is mostly arthropods and may also include small vertebrates. It forages in dense undergrowth, usually by itself or in pairs, and only occasionally joins mixed-species feeding flocks. It gleans and probes for its prey along mossy branches and in debris caught in the undergrowth.<p>The streak-capped treehunter's breeding season has not been fully defined but spans from at least April to December overall. It is thought to be monogamous. It excavates a tunnel up to about 1 m (3.5 ft) long in an earthen bank and builds a cup nest of rootlets in the chamber at its end. The only known clutch was of two eggs. The incubation period and time to fledging are not known. Both parents provision the nestlings.<p>The streak-capped treehunter's song is "a short and evenly pitched series of emphatic and well-enunciated notes, 'chup, cheyp-cheyp-cheyp-cheyp-cheyp' ". Its call is "a fast, sharp 'ch-di-dit', 'chi-dik' or 'ju-dut', repeated at intervals of several seconds". It also makes "a nasal 'jwick' " alarm call.

Conservazione

Tendenza della popolazione

stable