Mouse-colored Tyrannulet Phaeomyias murina


Justification of Red List Category
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be increasing, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Population justification
The global population size has not been quantified, but this species was described as 'fairly common but patchily distributed', prior to being split (Stotz et al. 1996).

Trend justification
This species spreads into areas following deforestation (del Hoyo et al. 2004), and is therefore suspected to be increasing overall.

Distribution and population

Subspecies P. m. eremonoma occurring in the Pacific lowlands of S Costa Rica and Panama (Chiriquí to Panamá). Subspecies P. m. incomta occurring in Colombia (N and Andes) and NE Ecuador E to Venezuela (except S Amazonas), Trinidad (including Monos I), Suriname and the Guianas. Subspecies P. m. wagae occurring in the Guianas, Amazonian Brazil, E Peru and N Bolivia. Subspecies P. m. murina occurring in C, E & S Brazil (Maranhão, Ceará and Pernambuco S to Mato Grosso and São Paulo), C & S Bolivia (Cochabamba S to Tarija), Paraguay and NW & NE Argentina (S to La Rioja and E Chaco).


Text account compilers
Butchart, S., Ekstrom, J., Hardenbol, A.

Recommended citation
BirdLife International (2021) Species factsheet: Phaeomyias murina. Downloaded from on 27/11/2021. Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from on 27/11/2021.