The chestnut-winged hookbill is 17 to 19 cm (6.7 to 7.5 in) long and weighs 30 to 39 g (1.1 to 1.4 oz). It is a largish furnariid with distinctive plumage, and a moderately hooked bill resembling those of Thamnophilus antshrikes. The sexes have the same plumage. Adults have a wide whitish to buff supercilium, grizzled brownish and buff lores, brown ear coverts with pale streaks, and yellowish buff malars. Their crown is very dark brown with obvious narrow gold-buff streaks. Their back is a paler, somewhat grayish olive, brown, with paler and less well defined streaks. Their rump and uppertail coverts are an even lighter brown with fainter streaks. Their wing coverts are dull chestnut with pale shafts; the flight feathers have dull chestnut outer webs and dark fuscous inner webs and tips. Their tail is bright rufous. Their throat is pale yellowish buff with faint dull brownish flecks, their breast dull yellowish buff with blurry browish streaks, their belly like the breast but only faintly streaked, their flanks dull brownish with yellowish buff streaks, and their undertail coverts mottled dull buff and light browish. Their iris is brown, their maxilla blackish to dark horn, their mandible blue-gray to bluish ivory, and their legs and feet yellowish brown to pale brownish olive. Juveniles have less regular streaks on their upperparts and darker and narrower streaks on their underparts than adults.[7][8][9][10]
The chestnut-winged hookbill is found in the Amazon Basin from southeastern Colombia south through eastern Ecuador and eastern Peru into northern Bolivia and east in Brazil to the Rio Tapajós. In Brazil it mostly occurs south of the Amazon but has been recorded north of it in
Jaú National Park.[7][11] It inhabits tropical lowland evergreen forest. It strongly favors terra firme forest but does occur locally in várzea. In elevation it mostly occurs below 500 m (1,600 ft) but can be found locally up to 900 m (3,000 ft).[7][8][9][10]
The chestnut-winged hookbill feeds on arthropods. It typically forages singly or in pairs, and usually in mixed-species feeding flocks. It mostly forages between the forest's mid-storey and its canopy while moving slowly along branches and in vine tangles. It finds its prey by gleaning, often from dead leaves.[7][8][9][10]
The chestnut-winged hookbill's song is "a fast, ascending trill that increases in loudness as it levels off in pitch, then ends abruptly" and can last for 30 seconds or more.[7] It has also been described as a "sustained gently undulating, slightly angry-sounding rattle".[10] Its calls include "a harsh, buzzing 'bzzt' "[7] and "teejuw"[10]. It also makes a short ascending trill.[7][9]
The IUCN has assessed the chestnut-winged hookbill as being of Least Concern. It has a vary large range, and though its population size is not known it is believed to be stable. No immediate threats have been identified.[1] It is considered uncommon to locally common and is found in several protected areas.[7]
^Remsen, 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 31 May 2023. Species Lists of Birds for South American Countries and Territories. https://www.museum.lsu.edu/~Remsen/SACCCountryLists.htm retrieved May 31, 2023
^Clements, J. F., T. S. Schulenberg, M. J. Iliff, T. A. Fredericks, J. A. Gerbracht, D. Lepage, S. M. Billerman, B. L. Sullivan, and C. L. Wood. 2022. The eBird/Clements checklist of birds of the world: v2022. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/ retrieved November 10, 2022
^ abcdefghijRemsen, Jr., J. V. (2020). Chestnut-winged Hookbill (Ancistrops strigilatus), 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.chwhoo1.01 retrieved September 2, 2023
^ abcMcMullan, Miles; Donegan, Thomas M.; Quevedo, Alonso (2010). Field Guide to the Birds of Colombia. Bogotá: Fundación ProAves. p. 121. ISBN978-0-9827615-0-2.
^ abcdRidgely, Robert S.; Greenfield, Paul J. (2001). The Birds of Ecuador: Field Guide. Vol. II. Ithaca: Cornell University Press. p. 366. ISBN978-0-8014-8721-7.
^ abcdevan Perlo, Ber (2009). A Field Guide to the Birds of Brazil. New York: Oxford University Press. p. 222. ISBN978-0-19-530155-7.
^Borges, S.H. and Almeida, R.A.M. de (2011). Birds of the Jaú National Park and adjacent areas, Brazilian Amazon: new species records with reanalysis of a previous checklist. Rev. Bras. Orn. 19(2): 108–133.
