• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

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). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to 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 given recent taxonomic splits. Prior to being split, the species has been described as 'fairly common' (Stotz et al. 1996).

Trend justification
The population trend has not been investigated. Tree cover loss within the range is low (3% over ten years; Global Forest Watch 2021, using Hansen et al. [2013] data and methods disclosed therein). Population declines are therefore likely equally low and localised; they are here tentatively placed in the band 1-9% over ten years.

Text account compilers
Hermes, C.

Contributors
Butchart, S., Ekstrom, J. & Wheatley, H.

---

Recommended citation
BirdLife International (2024) Species factsheet: Yellow-margined Flatbill Tolmomyias assimilis. Downloaded from https://datazone.birdlife.org/species/factsheet/yellow-margined-flatbill-tolmomyias-assimilis on 22/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/12/2024.