Family Typical Antbirds (Thamnophilidae)

Near Threatened

Unicolored Antwren (Myrmotherula unicolor)


French: Myrmidon unicolore German: Paranáameisenschlüpfer Spanish: Hormiguerito unicolor

Myrmothera unicolor


, 1835,

no locality = Rio de Janeiro, Brazil


Formerly treated as conspecific with M. snowi; also appears to be closely related to M. grisea and M. behni of Andes and N Amazonian mountains. The four have together been termed the “Plain-winged Myrmotherula group”; this is often combined with the “grey antwren assemblage” (see M. axillaris). Monotypic.


Coastal SE Brazil (N Rio de Janeiro S to N Rio Grande do Sul).

Descriptive notes

9–10 cm; 6·5–8·5 g. Male is grey, paler below; base of throat feathers black, tips grey. Female is olive-brown above, slightly greyer on crown and nape, uppertail... read more


Loudsong a series of simple, slightly down­slurred notes on approximately same pitch (c. 4 kHz... read more


Understorey and mid-storey of lowland evergreen forest and mature second-growth woodland; locally (... read more

Food and feeding

Little published. Feeds on small insects, including orthopterans (Tettigoniidae) and lepidopteran adults (moths) and larvae, also spiders.... read more


Three nests found in Nov in São Paulo; juvenile-plumaged males seen in close company of adults in late Oct in Santa Catarina. Nest a cup,... read more


Presumed resident.

Status and conservation

Not globally threatened. Currently considered Near Threatened, and previously, Vulnerable. Restricted-range species: present in Atlantic Forest Lowlands EBA. Uncommon,... read more

Recommended citation

Zimmer, K. & Isler, M.L. (2020). Unicolored Antwren (Myrmotherula unicolor). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 24 February 2020).