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

Justification of Red List category
This species has a very 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 is very large, and hence does not 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 is suspected to number 50,000-499,999 mature individuals (Partners in Flight 2022).

Trend justification

The population trend has not been investigated. Tree cover within the range has been lost at a rate of 14% over the past ten years; since 2016 this has been increasing to a rate equivalent to 20% over ten years (Global Forest Watch 2021, using Hansen et al. [2013] data and methods disclosed therein). Apart from forests, the species readily occupies edge, tall second growth, plantations, gardens and scrub (Fitzpatrick 2020); consequently, current deforestation may not be affecting the population at an equal rate. The rate of population decline is therefore here placed in the band 1-19% over ten years.

Text account compilers
Hermes, C.

Contributors
Butchart, S., Ekstrom, J. & Palmer-Newton, A.

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Recommended citation
BirdLife International (2024) Species factsheet: Yellow-bellied Tyrannulet Ornithion semiflavum. Downloaded from https://datazone.birdlife.org/species/factsheet/yellow-bellied-tyrannulet-ornithion-semiflavum on 23/12/2024.
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 23/12/2024.