The striated antthrush (''Chamaeza nobilis''), sometimes called the noble antthrushRemsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, G. Del-Rio, A. Jaramillo, D. F. Lane, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 27 July 2024. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved July 28, 2024, is a species of

bird Birds are a group of warm-blooded vertebrates constituting the class (biology), class Aves (), characterised by feathers, toothless beaked jaws, the Oviparity, laying of Eggshell, hard-shelled eggs, a high Metabolism, metabolic rate, a fou ...

in the family

Formicariidae Formicariidae is a family of smallish suboscine passerine birds of subtropical and tropical Central and South America known as antthrushes. They are between in length, and are most closely related to the ovenbirds in the family Furnariidae, an ...

. It is found in

Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

Colombia Colombia, officially the Republic of Colombia, is a country primarily located in South America with Insular region of Colombia, insular regions in North America. The Colombian mainland is bordered by the Caribbean Sea to the north, Venezuel ...

Ecuador Ecuador, officially the Republic of Ecuador, is a country in northwestern South America, bordered by Colombia on the north, Peru on the east and south, and the Pacific Ocean on the west. It also includes the Galápagos Province which contain ...

, and

Peru Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pac ...

Taxonomy and systematics

The striated antthrush was described by the English ornithologist and bird artist

John Gould John Gould (; 14 September 1804 – 3 February 1881) was an English ornithologist who published monographs on birds, illustrated by plates produced by his wife, Elizabeth Gould (illustrator), Elizabeth Gould, and several other artists, includ ...

in 1855 and given its current

binomial name In taxonomy, binomial nomenclature ("two-term naming system"), also called binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin grammatical forms, altho ...

''Chamaeza nobilis''. The striated antthrush has three subspecies, the

nominate Nomination is part of the process of selecting a candidate for either election to a public office, or the bestowing of an honor or award. A collection of nominees narrowed from the full list of candidates is a short list. Political office In th ...

''C. n. nobilis'' (Gould, 1855), ''C. n. rubida'' ( Zimmer, JT, 1932), and ''C. n. fulvipectus'' (

Todd Todd or Todds may refer to: Places Australia * Todd River, an ephemeral river United States * Todd Valley, California, also known as Todd, an unincorporated community * Todd, Missouri, a ghost town * Todd, North Carolina, an unincorporated c ...

, 1927). Several authors have suggested that ''C. n. fulvipectus'' should be treated as a separate species.

Description

The striated antthrush is long and weighs about . The sexes are alike. Adults of the nominate subspecies have a dark rufescent brown crown. They have white or buff lores and a white streak behind their eye on an otherwise rufescent brown face. They have a white spot on the side of their neck. Their back, rump, and wings are dark rufescent brown to brown. Their tail is dark olive-brown with a black band near the end and thin white tips on the feathers. Their throat is white. Their underparts are mostly white with a black scalloped effect on their breast and flanks, Their crissum is white with a buff wash and some light black markings. Their iris is dark brown, their bill black with a pinkish brown base to the

mandible In jawed vertebrates, the mandible (from the Latin ''mandibula'', 'for chewing'), lower jaw, or jawbone is a bone that makes up the lowerand typically more mobilecomponent of the mouth (the upper jaw being known as the maxilla). The jawbone i ...

, and their legs and feet dark gray. Subspecies ''C. n. rubida'' has a smaller white patch on its neck than the nominate. ''C. n. fulvipectus'' has a rich yellow-ochre breast rather than white.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 retrieved August 27, 2024Schulenberg, T.S., D.F. Stotz, D.F. Lane, J.P. O’Neill, and T.A. Parker III. 2010. ''Birds of Peru''. Revised and updated edition. Princeton University Press, Princeton, New Jersey. Plate 176

Distribution and habitat

The striated antthrush is a bird of the central and western

Amazon Basin The Amazon basin is the part of South America drained by the Amazon River and its tributary, tributaries. The Amazon drainage basin covers an area of about , or about 35.5 percent of the South American continent. It is located in the countries ...

. The nominate subspecies is found south of the Amazon River in eastern Peru, extreme northwestern Bolivia, and west-central Brazil east to the

Purus River The Purus River (Portuguese: ''Rio Purus''; Spanish: ''Río Purús'') is a tributary of the Amazon River in South America. Its drainage basin is , and the mean annual discharge is . The river shares its name with the Alto Purús National Park a ...

and perhaps beyond to the

Madeira River The Madeira River ( ) is a major waterway in South America. It is estimated to be in length, while the Madeira-Mamoré is estimated near or in length depending on the measuring party and their methods. The Madeira is the biggest tributary of ...

. Subspecies ''C. n. rubida'' is found south of the Amazon from southeastern Colombia south through eastern Ecuador into northeastern Peru and east just into western Brazil. ''C. n. fulvipectus'' is found south of the Amazon between the

Tapajós The Tapajós ( ) is a river in Brazil. It runs through the Amazon Rainforest and is a major tributary of the Amazon River. When combined with the Juruena River, the Tapajós is approximately long. Prior to a drastic increase in illegal gold mi ...

and Xingu rivers. Populations further west to the Madeira and south into northern

Rondônia Rondônia () is one of the 26 states of Brazil, located in the northern subdivision of the country (central-western part). It is bordered by Acre (state), Acre in the west, Amazonas, Brazil, Amazonas in the north, Mato Grosso in the east, and Bo ...

are probably also this subspecies. The striated antthrush primarily inhabits the floor of '' terra firme'' forest with sparse undergrowth. In elevation it reaches in Colombia and Ecuador, in Peru, and possibly in Bolivia.

Behavior

Movement

The striated antthrush is believed to be a year-round resident throughout its range.

Feeding

The striated antthrush's diet and foraging behavior are not known. It is almost entirely terrestrial; it walks slowly and deliberately on the forest floor.

Breeding

The striated antthrush's breeding season is not fully known but includes June in Colombia. The one known nest was in a deep cavity in a live tree; it had no lining and contained one nestling. Nothing else is known about the species' breeding biology.

Vocalization

The song of the nominate subspecies and ''C. n. rubida'' is "a long, accelerating, descending series of hollow, hooting whistles that abruptly becomes a much slower-paced descending series of rising hoots...''poop poop-pu-pu-pu'pu'pu'pu'pupupupupupupupupupu-WOOP WOOP woop woop woop''". That of ''C. n. fulvipectus'' is much slower and has many fewer notes than the others' song. The three subspecies appear to have the same calls, a series of gurgles and "a fairly clear 'quick' ".

Status

The

IUCN The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the status ...

has assessed the striated antthrush as being of Least Concern. It has a very large range; its population size is not known and is believed to be stable. No immediate threats have been identified. It is considered generally uncommon though fairly common in Colombia and Ecuador and rare in Peru. It is known from several protect areas.

References

{{Taxonbar, from=Q859967

striated antthrush The striated antthrush (''Chamaeza nobilis''), sometimes called the noble antthrushRemsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, G. Del-Rio, A. Jaramillo, D. F. Lane, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 27 Ju ...

Birds of the Amazon rainforest

Taxonomy articles created by Polbot