The sharp-tailed streamcreeper (Lochmias nematura) is a passerinebirdofSouth America in the Furnariinae subfamily of the ovenbird familyFurnariidae.[2] Alternate names include streamside Lochmias[3], sharp-tailed creeper[4], and simply streamcreeper[5]. It is found in Panama and every mainland South American country except Chile, French Guiana, and Suriname.[3][6]
Subspecies L. n. obscuratus might be a separate species, but this idea is complicated by L. n. sororius, whose characteristics are intermediate between obscuratus and the nominate subspeciesL. n. nematura.[7]
The sharp-tailed streamcreeper is 13 to 14 cm (5.1 to 5.5 in) long and weighs 20 to 38 g (0.71 to 1.3 oz). It is a rather dark furnariid with a long and slightly decurved bill. The sexes' plumages are alike. Adults of the nominate subspecies have a narrow ragged white supercilium, blackish lores, dull brownish ear coverts with rufescent shafts, and a whitish malar area. Their crown is dark brown with faint spots on the forehead. Their back is rich reddish brown that blends to a blackish rump and uppertail coverts. Their tail is sooty blackish and has a "spiny" appearance because the feather tips have bare shafts. Their wings are a similar reddish brown to the back. Their chin is whitish, their throat feathers whitish with dark brown tips, their breast dull dark brown heavily spotted white, and their belly colored like the breast but with white streaks. Their undertail coverts are blackish brown with pale shafts. Their iris is dark brown to brown, their maxilla black to brownish, their mandible black to grayish horn, and their legs and feet highly variable from dull pink to dark brown. Juveniles are similar to adults but with less well defined, somewhat buffy, spots on their underparts.[7]
The other subspecies of the sharp-tailed streamcreeper differ from the nominate and each other thus:[7]
L. n. obscuratus, little or no supercilium, duller brown less reddish back, throat and breast darker with oblong or diamond-shaped spots, belly and flanks darker and unspotted
L. n. sororius, back and rump color more reddish than obscuratus' but less than nominate's, underparts' pattern also intermediate between them
L. n. nelsoni, darker less rufescent upperparts and more grayish underparts with less spotting than nominate
L. n. chimantae, much like nominate with darker, more brownish back
L. n. castanonotus, chestnut-brown upperparts, less spotting and streaking on underparts than nominate
L. n. obscuratus: Andes from Peru's Department of Huánuco south through Bolivia into northwestern Argentina's Jujuy and Salta provinces
L. n. nematura: Brazil from Mato GrossotoBahia and south through eastern Paraguay into northeastern Argentina to Entre Ríos Province and much of Uruguay
The sharp-tailed streamcreeper was first seen in Guyana in 2002 and a specimen was collected there in 2004. It is not positively known which of the Venezuelan subspecies the Guyanese records belong to, though they are attributed to L. n. castanonotus.[8][7]
The sharp-tailed streamcreeper is always found near streams and small rivers with dense undergrowth. In the mountains of Panama and Venezuela and south through the Andes it inhabits montane evergreen forest at elevations between 700 and 2,800 m (2,300 and 9,200 ft). In its southeastern range it inhabits lowland evergreen forest and mature secondary forest.[7][9][10][11][12]
The sharp-tailed streamcreeper's diet includes a wide variety of arthropods and also tadpoles; there is a record of one eating an adult frog. It forages singly or in pairs, walking and hopping on the ground, among leaf litter and moss on rocks, and shallow streambeds to glean, probe, and toss aside leaves for prey.[7][13][10][11]
The sharp-tailed streamcreeper's breeding season has not been fully defined. In Venezuela it nests during the wet season; in southeastern Brazil the nesting season includes September. The species is believed to be monogamous. Its nest is a ball of roots and twigs with a lining of leaves constructed in a chamber at the end of a tunnel in an earthen bank. The clutch size is two eggs. The incubation period, time to fledging, and details of parental care are not known.[7]
The sharp-tailed streamcreeper's song appears to vary little among its disjunct populations. The song is "a series of dry notes that gradually accelerate and ascend, then stay on same pitch, then descend abruptly". Its calls have been written as "sea-sick", "seesee-sik", "tsiterit", and "tsitit". Its alarm call is "chet-chet-chet".[7][12]
The IUCN has assessed the sharp-tailed streamcreeper as being of Least Concern. It has a very large range and an estimated population of at least 500,000 mature individuals. The population, however, is believed to be decreasing. No immediate threats have been identified.[1] It is found locally in Panama.[3] It is considered rare to uncommon in the Andes (though locally common in southern Bolivia) and uncommon to locally fairly common in the southeast. It occurs in several protected areas.[7]
^ abcCheck-list of North American Birds (7th ed.). Washington, D.C.: American Ornithologists' Union. 1998.
^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. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved May 31, 2023
^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
^ abcdefghijkRemsen, Jr., J. V., A. Bonan, and E. de Juana (2020). Sharp-tailed Streamcreeper (Lochmias nematura), 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.shtstr1.01 retrieved August 23, 2023
^O'Shea, B.J.; Milensky, Christopher M.; Claramunt, Santiago; Schmidt, Brian K.; Gebhard, Christina A.; Schmitt, C. Gregory & Erskine, Kristine T. (2007): New records for Guyana, with description of the voice of Roraiman Nightjar Caprimulgus whitelyi. Bull. B.O.C.127(2): 118–128. PDF fulltext
^Salaman, Paul G.W.; Stiles, F. Gary; Bohórquez, Clara Isabel; Álvarez-R., Mauricio; Umaña, Ana María; Donegan, Thomas M. & Cuervo, Andrés M. (2002): New and noteworthy bird records from the east slope of the andes of Colombia. Caldasia24(1): 157–189. PDF fulltext
^ abMcMullan, Miles; Donegan, Thomas M.; Quevedo, Alonso (2010). Field Guide to the Birds of Colombia. Bogotá: Fundación ProAves. p. 123. ISBN978-0-9827615-0-2.
^ abRidgely, Robert S.; Greenfield, Paul J. (2001). The Birds of Ecuador: Field Guide. Vol. II. Ithaca: Cornell University Press. p. 377. ISBN978-0-8014-8721-7.
^ abvan Perlo, Ber (2009). A Field Guide to the Birds of Brazil. New York: Oxford University Press. p. 224. ISBN978-0-19-530155-7.
^de L. Fávaro, Fernando; dos Anjos, Luiz; Lopes, Edson V.; Mendonça, Luciana B. & Volpato, Graziele H. (2006): Efeito do gradiente altitudinal/latitudinal sobre espécies de aves florestais da família Furnariidae na Bacia do Rio Tibagi, Paraná, Brasil [Effect of altitudinal/latitudinal gradient about forest ovenbirds species (Aves: Furnariidae) in the Tibagi river basin, Paraná, Brazil]. [Portuguese with English abstract] Revista Brasileira de Zoologia23(1): 261–266. doi:10.1590/S0101-81752006000100020PDF fulltext
