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 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.
The global population is estimated to number > c.100,000 individuals (Ferguson-Lees et al. 2001).
The population is suspected to be declining locally owing to ongoing persecution through shooting (Ferguson-Lees and Christie 2001).
Loss of breeding habitat in forests in north-east China is attributed to agricultural development and timber harvesting (Deng et al. 2003). In Japan, abandonment and development of traditional paddy fields is thought to have contributed to the species's decline (Ueta et al. 2006). Up to 1,000 birds are shot annually on migration in Taiwan (China) (Orta et al. 2014).
Text account compilers
Butchart, S., Ekstrom, J., Harding, M., Symes, A. & Ashpole, J
BirdLife International (2020) Species factsheet: Butastur indicus. Downloaded from http://www.birdlife.org on 06/06/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 06/06/2020.