White-collared Foliage-gleaner
Anabazenops fuscus
Large foliage-gleaner with a wedge-shaped bill. Found in the middle and lower levels of forests with bamboo where it acrobatically hangs upside-down on branches and searches for prey in clusters of dead leaves. Note the dark-brown face that is set off with a prominent pale eyebrow, a pale eyering, and a white collar. It is olive-brown on the back with a buff belly and rufous tail. The song is a loud and fast series of “jek-jek-jek” notes.
Identification
The white-collared foliage-gleaner is about 20 cm (7.9 in) long. It has a large wedge-shaped bill. The sexes' plumages are alike. Adults have a well-defined whitish supercilium, grayish white lores, and a white malar area on an otherwise dark brown face. Their crown is a rich dark brown with a faint scalloped appearance. Their throat is white and their entire neck is circled with a wide white band. Their back and rump are a lighter brown than the crown and their uppertail coverts and tail are dark rufous. Their wings are the same brown as the back with a bright yellowish brown bend. Their upper breast is grayish buff with a tawny tinge that becomes a darker tawny-brownish lower breast and belly. Their flanks and undertail coverts are darker and browner than the breast and belly. Their iris is dark brown or dark reddish brown, their maxilla dusky brown with a pale horn edge, their mandible pale horn or pale gray, and their legs and feet olive-gray, brownish gray, or dark olive-brown. Juveniles are similar to adults with a tawny-buff tinge to the supercilium and underparts.
Taxonomy
The white-collared foliage-gleaner shares its genus with the bamboo foliage-gleaner (A. dorsalis). It is monotypic.
- Scientific name
- Anabazenops fuscus
- Authority
- (Vieillot, 1816)
- Order
- Passeriformes
- Family
- Furnariidae
- Genus
- Anabazenops
Range and habitat
The white-collared foliage-gleaner is found in southeastern Brazil from Bahia and Minas Gerais south into Santa Catarina. It inhabits montane evergreen forest, both primary and secondary, and is closely associated with large thickets of bamboo. In elevation it ranges between 350 and 1,200 m (1,100 and 3,900 ft).
- Migration
- Resident species
Behavior
The white-collared foliage-gleaner is a year-round resident throughout its range.<p>The white-collared foliage-gleaner feeds on arthropods. It usually forages in pairs and will occasionally join mixed-species feeding flocks. It forages mostly in the forest's middle levels; it will forage in the understory but only rarely does so on the ground. It acrobatically climbs vertical stems and gleans and probes for prey on them and among green and dead leaves. Much of its feeding is on bamboo.<p>The white-collared foliage-gleaner is assumed to be monogamous. It nests in a natural cavity in a branch. Nothing else is known about its breeding biology.<p>The white-collared foliage-gleaner's song has been described as a "high, musical, slightly lowered 'djepdjep---' " and as "low-pitched, evenly spaced 'tchook' notes...becoming louder after first few notes. It also makes a "distinctive high-pitched, squeaky 'chek, jééurr-jééurr-jééurr-jééurr-jééurr'...and [a] hoarse, syncopated 'wrr-jek, wrjejek, wrrjejek' ". Its alarm call is "a piercing 'ghéé-eh' ".
Conservation
- Population trend
- declining
Photos
Distribution
Bird Calls
Other Birds
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Rather small antbird with a disjunct distribution. Males have a yellow face and underparts with a black crown, eye-line, and streaks on the breast. Females have a yellow streaked crown. Southeastern subspecies has ochraceous lower underparts. Song is a descending and decelerating series of fluted notes becoming harsher at the end. Found in the understory of humid forests, often in areas of transitional forest or poor soils. Rarely accompanies mixed-species flocks. The similar Spix's and Peruvian Warbling-Antbirds have white breasts, and the song of Peruvian is somewhat slower-paced.
Tepui Spinetail
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Imperial Amazon
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