Red List Category
for more information about the Red List categories and criteria
Justification of Red List category
This species is classified as Endangered because it has a very small population, and although the population in Japan is stable, the mainland Asian population continues to decline owing to loss and degradation of wetlands through conversion to agriculture and industrial development.
1650 mature individuals
Distribution size (breeding/resident):
Land-mass type - continent - Continents are land masses > bigger than Australia (=7,682,300 sq km).
Land-mass type - shelf island - Continental islands include all other islands or island groups. Generally they were once part of continents and lie on a continental shelf of < 200 m sea depth.
Realm - Palearctic - realm
IUCN Ecosystem -- Freshwater biome
IUCN Ecosystem -- Terrestrial biome
IUCN Ecosystem -- Marine biome