- Striated Antthrush
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Striated Antthrush Chamaeza nobilis Scientific name definitions

Niels Krabbe and Thomas S. Schulenberg
Version: 1.0 — Published March 4, 2020
Text last updated January 1, 2003

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Introduction

Also sometimes known as the Noble Antthrush, the Striated Antthrush is the sole representative of the genus Chamaeza to occur in Amazonia, where it is largely restricted to the western half of the basin. Here, it prefers terra firme forest below 1000 m, and like congenerics can be difficult to observe, especially without employing playback of the species’ ‘hooting’ vocalizations. The plumage is principally warm brown over the bird’s upperparts, relieved only by a white supercilium and line on the lower neck, whereas the underparts are largely whitish, albeit heavily streaked with blackish. Although the Striated Antthrush’s behavior is undoubtedly similar to those of its congenerics, very little has to date been published concerning the species’ ecology. Three subspecies are generally recognized, of which that in the easternmost section of the species’ range deserves additional taxonomic study.

Field Identification

22·5 cm; three males 120–152 g, female 119–150 g. Adult has crown dark rufescent brown, lores white or buff; white postocular streak, white spot on side of neck between auriculars and wing; back, rump and wings dark rufescent brown to brown, tail dark olive-brown with black subterminal band and narrow white tip; underparts white, breast and flank feathers broadly edged with black, centre of belly unmarked or only lightly scalloped, crissum lightly washed buff and lightly marked with black; iris dark brown; bill black, base of lower mandible pinkish-brown; tarsus dark grey. Juvenile not described. Race rubida has smaller white patch on side of neck; fulvipectus has breast rich yellow-ochre, not white.

Systematics History

Editor's Note: This article requires further editing work to merge existing content into the appropriate Subspecies sections. Please bear with us while this update takes place.

Probably closest to C. campanisona and C. meruloides. Race fulvipectus differs vocally from others: although structurally and tonally very similar (in two parts, first an accelerating series of notes, second a slow even series of notes), song is much shorter, lacking the long-drawn fast “bubbling” series at end of first part. Racial identity of birds from EC Amazonian Brazil (R Purus E to R Madeira) uncertain; further study needed. Three subspecies recognized.

Subspecies


SUBSPECIES

Chamaeza nobilis rubida Scientific name definitions

Distribution

N of R Amazon in SE Colombia, E Ecuador and NE Peru; presumably also in immediately adjacent W Brazil.

SUBSPECIES

Chamaeza nobilis nobilis Scientific name definitions

Distribution

S of R Amazon from E Peru (S from Huallaga Valley) E to WC Brazil (E to at least R Purus, probably to R Madeira) and S to extreme NW Bolivia.

SUBSPECIES

Chamaeza nobilis fulvipectus Scientific name definitions

Distribution

NC Brazil at Santarém, left bank of R Tapajós, recorded in Tapajós–Xingu interfluvium (1); probably also including birds W to R Madeira and possibly those S to N Rondônia.

Distribution

Editor's Note: Additional distribution information for this taxon can be found in the 'Subspecies' article above. In the future we will develop a range-wide distribution article.

Habitat

Humid forest, especially in terra firme forest where undergrowth is sparse. Lowlands to 700 m, occasionally to 1000 m.

Movement

Presumably sedentary.

Diet and Foraging

Diet not documented. Alone or in pairs; walks slowly on the forest floor.

Sounds and Vocal Behavior

Song (rubida) a slowly accelerating (3–16 notes per second) and rising (550–600 Hz) series 11–12 seconds long of hollow notes, at first increasing in volume, followed by a shorter (2–3 seconds) falling (600–450 Hz) series of 5–8 whooping notes at decreasing volume; song of fulvipectus distinctly slower than in other populations, with many fewer notes, at distance sounding not unlike song of Black-girdled Barbet (Capito dayi). Calls (rubida) include a 3·7-second falling (1·65–1·4 kHz) series of c. 22 gurgles; also a fairly clear “quick” like that of C. campanisona, but top pitch better defined (as in C. turdina) and lower (1·82 kHz).

Breeding

Fledging recorded in mid-Jun in Colombia. Only nest nest known, in a cavity 3 m above ground in a live tree; cavity 30 cm deep, contained a few feathers but no lining; single young fledged.
Not globally threatened. Generally uncommon; rare to locally fairly common in Ecuador; rare to uncommon or fairly common in Peru. Difficult to locate, however, as it tends to be quiet for several weeks at a time. Occurs in several protected areas within its vast range.
Distribution of the Striated Antthrush - Range Map
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  • Migration
  • Breeding
  • Non-Breeding
Distribution of the Striated Antthrush

Recommended Citation

Krabbe, N. and T. S. Schulenberg (2020). Striated Antthrush (Chamaeza nobilis), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.strant3.01
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