Data Zone
Justification of Red List category
This species is suspected to have a small population, fragmented into different subpopulations. The population and subpopulation sizes are not thought to meet the threshold for Vulnerable, but they may approach these values and hence the species is listed as Near Threatened. Further information regarding population size estimates may lead to this species being uplisted in the future.
Population justification
Based on known records, low population density estimates for closely related species and assuming only a proportion of its range is occupied, this species likely has a population size of >10,000 mature individuals, with >1,000 mature individuals in each subpopulation. However, the global population size may approach this threshold value and so the population size is tentatively placed in the range of 10,000-19,999 mature individuals.
Trend justification
The population is suspected to be in decline owing to ongoing habitat destruction.
Cyornis herioti is found only in northern and central Luzon, Philippines.
This species inhabits lowland to submontane forest (Clement and de Juana 2016).
Extensive deforestation on Luzon as a result of logging, agricultural conversion and mining activities has been the probable driver of such scarcity in the lowlands as the species’s habitat has been destroyed (see Poulsen 1995).
Conservation Actions Underway
No targeted conservation actions are known for this species.
Conservation Actions Proposed
Monitor population trends and rates of habitat loss throughout its range. Campaign for the protection of remaining areas of lowland forest on Luzon.
Text account compilers
Butchart, S., Ekstrom, J. & Westrip, J.
Recommended citation
BirdLife International (2024) Species factsheet: Blue-breasted Blue Flycatcher Cyornis herioti. Downloaded from
https://datazone.birdlife.org/species/factsheet/blue-breasted-blue-flycatcher-cyornis-herioti on 19/12/2024.
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 19/12/2024.