Data Zone
Justification of Red List category
This species is likely to be in moderately rapid decline owing to continued habitat loss and degradation, and is therefore considered Near Threatened. It should be monitored carefully for future increases in the rate of decline.
Population justification
The global population size of this species has not been quantified, but c.75,000 km2 of forest remains in its range (per Global Forest Watch 2022). Even accounting for descriptions of its abundance as local or rare (del Hoyo et al. 2005, Eaton et al. 2021), the population size is therefore unlikely to be especially small, even if only a portion of forest in its range is occupied.
Trend justification
This species is dependent on lowland, good-quality forest (Eaton et al. 2021, J. Eaton in litt. 2022). In the three generations (12.6 years; Bird et al. 2020) to 2021, forest extent (of >50% cover) was reduced in this species' range by 14-16% (Global Forest Watch 2022, based on data from Hansen et al. [2013] and methods disclosed therein). These data do not account for habitat degradation, nor for the fact that this species most likely occurs at higher densities at the lowest elevations of good forest. Consequently, the rate of forest cover loss is thought to represent the minimum possible rate of population reduction. In the past three generations, it is therefore suspected of having declined by 15-25%. There is little indication this rate will slow in the future, with rates of forest cover loss between 2016 and 2021 showing a moderate acceleration, and projections by Voigt et al. (2021) indicating that forests favoured by this species are most at risk. The same rate of population reduction is therefore suspected to occur over the next three generations.
Coracina bicolor is restricted to Sulawesi, Indonesia, and its satellites. It is known on Sangihe from a single specimen collected in 1864; with no records since, it is now assumed to be extinct here.
This species inhabits lowland primary forest and hill forest with clearings up to 900 m, although in many places it is only found at lower altitudes.
Habitat loss is the principal threat to this forest-dependent species and is thought to have caused commensurate declines. The chief drivers of habitat loss are forest encroachment for shifting agriculture, as well as larger-scale clearances for forestry.
Conservation Actions Underway
No targeted conservation actions are known for this species, although it occurs in a number of protected areas (UNEP-WCMC and IUCN 2022).
Conservation Actions Proposed
Conduct repeated surveys in areas within and surrounding the species' range to determine current distribution and abundance, as well as assess population trends. Conduct ecological studies to improve understanding of its precise habitat requirements, tolerance of secondary habitats and response to fragmentation. Protect areas of suitable habitat.
Text account compilers
Berryman, A.
Contributors
Eaton, J. & Martin, T.
Recommended citation
BirdLife International (2024) Species factsheet: Pied Cuckooshrike Coracina bicolor. Downloaded from
https://datazone.birdlife.org/species/factsheet/pied-cuckooshrike-coracina-bicolor on 25/11/2024.
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 25/11/2024.