Description and Ecology
This small woodcreeper is a slender bird, typically 13.1–19.3 cm (5.2–7.6 in) long, and weighing 8.6–18 g (0.30–0.63 oz). The head, upper back and underparts are lighter or darker greyish olive, and the wings, tail and lower back are light rufous. The bill is short and thin.
The normal call is a fast, high-pitched trill wu-wu-wu-we-we-we-we-ee-ee-ee-ee-we-we-we-we, but this varies geographically.
It breeds from southern Mexico through tropical Central and South America to northern Argentina and Uruguay, and also on Tobago. The species is found throughout the Amazon basin, but is absent from its lowest reaches, including much of the adjacent Guyanas.
There, the subspecies of the northeastern Amazon (S. g. axillaris) ranges at least to the Pakaraima Mountains, where it is fairly common at 1,200–1,400 m (3,900–4,600 ft) ASL, descending to about 850 m (2,790 ft) ASL on occasion. The olivaceous woodcreeper has also been recorded from extreme southern Guyana and the Essequibo River (which may be its eastern limit in the region). It is apparently completely absent from eastern Guyana eastwards through Suriname and French Guyana.
In Uruguay, it has yet been found only in some places of in Cerro Largo Department, but it is by no means rare within this limited range. The species has been recorded at the Yaguarón River near the Cuchilla de Mangrullo, as well as in the Sierra de los Ríos.
The olivaceous woodcreeper is a common and widespread bird of forests and other woodlands. It feeds on insects and spiders. It normally forages on tree trunks or large branches or on the ground, usually singly.[nb 1]
These birds may associate with foraging groups of golden lion tamarins (Leontopithecus rosalia) to snatch prey startled by the monkeys. They can also be occasionally seen catching flying prey like termites in mid-air, and will sometimes join mixed-species feeding flocks. In some places (e.g. in the Serra de Paranapiacaba of Brazil), they may even form a core species of such flocks.
It builds a nest lined with dead leaves in a tree hole and lays three white eggs.
- ffrench and/or Hilty seem to claim this species does not join mixed flocks often. This is contradicted by Machado, Olson & Alvarenga and O'Shea. Possibly different behaviours are associated with different taxa subspecies?
- BirdLife International (2012). "Sittasomus griseicapillus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- Patten, Michael A. (2011). Schulenberg, T.S., ed. "Overview – Olivaceous Woodcreeper (Sittasomus griseicapillus)". Neotropical Birds Online. Ithaca: Cornell Lab of Ornithology. Retrieved 17 July 2014. External link in
- O'Shea, B.J.; 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" (PDF). Bulletin of the British Ornithologists' Club. 127 (2): 118–128.
- Azpiroz, Adrián B.; Menéndez, José L. (2008). "Three new species and novel distributional data for birds in Uruguay". Bulletin of the British Ornithologists' Club. 128 (1): 38–56.
- Machado, C.G (1999). "A composição dos bandos mistos de aves na Mata Atlântica da Serra de Paranapiacaba, no sudeste brasileiro" [Mixed flocks of birds in Atlantic Rain Forest in Serra de Paranapiacaba, southeastern Brazil] (PDF). Revista Brasileira de Biologia (in Portuguese). 59 (1): 75–85. doi:10.1590/S0034-71081999000100010.
- Olson, Storrs L.; Alvarenga, Herculano M.F. (2006). "An extraordinary feeding assemblage of birds at a termite swarm in the Serra da Mantiqueira, São Paulo, Brazil" (PDF). Revista Brasileira de Ornitologia. Sociedade Brasileira de Ornitologia. 14 (3): 297–299.
- de Mello Beisiegel, Beatriz (2007). "Foraging Association between Coatis (Nasua nasua) and Birds of the Atlantic Forest, Brazil". Biotropica. The Association for Tropical Biology and Conservation. 39 (2): 283–285. doi:10.1111/j.1744-7429.2006.00255.x.
- ffrench, Richard (1991). A Guide to the Birds of Trinidad and Tobago (2nd ed.). Comstock Publishing. ISBN 0-8014-9792-2.
- Hilty, Steven L. (2003). Birds of Venezuela. Princeton University Press. ISBN 0-7136-6418-5.
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