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). The population trend appears to be increasing, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or 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 locally common in South Korea and common in the Philippines (del Hoyo et al. 2005), while national population estimates include: c.100-100,000 breeding pairs in China; c.10,000-1 million breeding pairs in Taiwan; c.10,000-100,000 breeding pairs in Korea and c.10,000-1 million breeding pairs in Japan (Brazil 2009).
The population is estimated to be increasing following a range expansion into urban areas in Japan during recent decades (del Hoyo et al. 2005).
Text account compilers
Butchart, S., Ekstrom, J.
BirdLife International (2019) Species factsheet: Hypsipetes amaurotis. Downloaded from http://www.birdlife.org on 10/12/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 10/12/2019.