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This species is listed as Critically Endangered because it is thought to have an extremely small population, which occupies a very restricted range in which habitat is extremely limited, severely fragmented and rapidly declining in quality, extent and area. Further conservation actions are required as a matter of urgency if this species is to survive.
SACC. 2006. A classification of the bird species of South America. Available at: http://www.museum.lsu.edu/~Remsen/SACCBaseline.html.
Myrmotherula unicolor (Sibley and Monroe 1990, 1993) has been split into M. unicolor and M. snowi following SACC (2005). Note that snowi was described as a new subspecies of M. unicolor by Teixeira and Gonzaga (1985).
9.5 cm. Small, uniform antwren. Male entirely grey, slightly paler below with inconspicuous small black patch on throat. Female entirely fulvous-brown above, russet tail. Rufous-buff underparts with white throat. Similar spp. Very similar to Unicoloured Antwren M. unicolor, but not sympatric and has shorter tail and longer bill, and female is more rufescent below. Voice Song is series of 3-6 downslurred, clear-whistled syllables. A kleek contact call and nyiih-nyeeh-nyaah alarm call have been described.
Collar, N. J.; Gonzaga, L. P.; Krabbe, N.; Madroño Nieto, A.; Naranjo, L. G.; Parker, T. A.; Wege, D. C. 1992. Threatened birds of the Americas: the ICBP/IUCN Red Data Book. International Council for Bird Preservation, Cambridge, U.K.
Roda, S. A.; Carlos, C. J.; Rodrigues, R. C. 2003. New and noteworthy records for some endemic and threatened birds of the Atlantic forest of north-eastern Brazil. Bulletin of the British Ornithologists' Club 123: 227-236.
Roda, S. A.; Pereira, G. A.; Dantas, S. D. 2009. Alagoas Antwren Myrmotherula snowi: a new locality and remarks on its conservation. Cotinga: 144-146.
Teixeira, D. M.; Gonzaga, L. P. 1985. Uma nova subespécie de Myrmotherula unicolor (Ménétries, 1835) do nordeste do Brazil. Boletim do Museu Nacional Rio de Janeiro Zoologia no.310.
Whitney, B. M.; Pacheco, J. F. 1995. Distribution and conservation status of four Myrmotherula antwrens (Formicariidae) in the Atlantic Forest or Brazil. Bird Conservation International 5(2/3): 421-439.
Whitney, B. M.; Pacheco, J. F. 1997. Behavior, vocalizations, and relationships of some Myrmotherula Antwrens (Thamnophilidae) in eastern Brazil, with comments on the "plain-winged" group. Ornithological Monographs 48: 809-819.
Detailed species account from the Threatened birds of the Americas: the BirdLife International Red Data Book (BirdLife International 1992). Please note, taxonomic treatment and IUCN Red List category may have changed since publication.
Text account compilers
Bird, J., Calvert, R., Capper, D., Mahood, S., Pople, R., Symes, A., Taylor, J.
Develey, P., Goerck, J., Olmos, F., Roda, S., Whittaker, A.
IUCN Red List evaluators
Butchart, S., Symes, A.
BirdLife International (2014) Species factsheet: Myrmotherula snowi. Downloaded from http://www.birdlife.org on 25/04/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 25/04/2014.
This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.
To provide new information to update this factsheet or to correct any errors, please email BirdLife
To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.
Additional resources for this species
|Current IUCN Red List category||Critically Endangered|
|Species name author||Teixeira & Gonzaga, 1985|
|Population size||30-200 mature individuals|
|Distribution size (breeding/resident)||150 km2|
|Links to further information|
|- Additional Information on this species|