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Yungas Tyrannulet Phyllomyias weedeni
BirdLife is updating this factsheet for the 2016 Red List
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This species is listed as Vulnerable as it is estimated to have a small population which is declining due to habitat destruction. Further surveys are needed to precisely establish the population size and trends, and the ability for the species to persist in mosaics of coffee plantations and forest.

Taxonomic source(s)
SACC. 2006. A classification of the bird species of South America. Available at: #

Taxonomic note
Phyllomyias weedeni (SACC 2005 + updates) was described as new to science by Herzog et al. (2008).

Distribution and population
Phyllomyias weedeni has only been recently described, and is known from the lower Yungas of Bolivia and Peru. In Bolivia, it is known from three localities in La Paz department, one locality in Beni department, and a further locality in Cochabamba department. In Peru, it is known from Puno department, 1-1.5 km from the Bolivian border. A full population survey has yet to be carried out, however its population is thought to number far fewer than 10,000 mature individuals based on its low density and patchy distribution (Herzog et al. 2008).

Population justification
The population has been estimated at well below 10,000 mature individuals based on low density and patchy distribution, hence the band 2,500-9,999 mature individuals seems appropriate. This equates to 3,750-14,999 individuals in total, rounded here to 3,500-15,000 individuals. More accurate surveys are required to precisely quantify the population size.

Trend justification
The population is inferred to be declining owing to ongoing habitat destruction (Herzog et al. 2008).

This species inhabits the upper canopy of evergreen Andean foothill and lower montane forest. It has been observed in mosaics of shade-coffee plantations and remnant forest patches, although it is not known whether this habitat can sustain a viable population. Little is known about its behaviour. It has almost always been observed in pairs, except in early March in southeast Peru. Foraging appears to comprise of short aerial sallies to catch flying insects (Herzog et al. 2008).

Its habitat is thought to be declining owing to large-scale conversion of forest habitat to subsistence farming (Herzog et al. 2008).

Conservation Actions Underway
No conservation action is known for the species, though it does occur in four protected areas in Bolivia (Herzog et al. 2008). Conservation Actions Proposed
Assess the population size and establish a monitoring programme to establish trends. Establish ecological requirements. Identify and assess threats. Preserve an area of suitable habitat. Conduct further surveys for this species within its altitudinal range.

Herzog, S. K.; Kessler, M.; Balderrama, J. A. 2008. A new species of Tyrannulet (Tyrannidae: Phyllomyias) from Andean foothills in northwest Bolivia and adjacent Peru. The Auk 125(2): 265-276.

Further web sources of information
Explore HBW Alive for further information on this species

Search for photos and videos, and hear sounds of this species from the Internet Bird Collection

Text account compilers
Calvert, R., Sharpe, C J

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2016) Species factsheet: Phyllomyias weedeni. Downloaded from on 22/10/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 22/10/2016.

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

ARKive species - Yungas tyrannulet (Phyllomyias weedeni) 0

Key facts
Current IUCN Red List category Vulnerable
Family Tyrannidae (Tyrant-flycatchers)
Species name author Herzog, Kessler & Balderrama, 2008
Population size 2500-9999 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 14,034 km2
Country endemic? No
Links to further information
- Additional Information on this species