The site was identified as important in 2009 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.Populations meeting IBA criteria ('trigger species'):
|Species||Current IUCN Red List Category||Season||Year(s)||Population estimate at site||IBA criteria met|
|Collared Partridge Arborophila gingica||NT||resident||2003||present||A1, A2, A3|
The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2009).
|Protected area (PA)||PA designation||PA area (ha)||Relationship of PA with IBA||Overlap of PA with IBA (ha)|
|Niumulin||Nature Reserve||250||is identical to site||250|
|Habitat (IUCN level 1)||Habitat detail||Extent (% of site)|
BirdLife International (2023) Important Bird Area factsheet: Niumulin Nature Reserve. Downloaded from http://datazone.birdlife.org/site/factsheet/niumulin-nature-reserve-iba-china-(mainland) on 01/10/2023.