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 threshold for Vulnerable under the population trend criterion (>30% decline over ten years of 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.
The global population size has not been quantified, but the species is described as regular and common on the south and western coastal plains of peninsular Malaysia, locally common to uncommon in southern Thailand, fairly common in the Greater Sundas, uncommon to rare in the Nicobar Islands, and elsewhere local and uncommon to rare. (del Hoyo et al. 2005).
The species is tentatively assessed as being in decline due to habitat loss per Tracewski et al. (2016) and high hunting pressure.
Text account compilers
Hermes, C., Butchart, S., Ekstrom, J.
BirdLife International (2023) Species factsheet: Lalage nigra. Downloaded from http://datazone.birdlife.org/species/factsheet/pied-triller-lalage-nigra on 22/09/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://datazone.birdlife.org on 22/09/2023.