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 fluctuating, 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 is extremely 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 population is estimated to number 100,000-1,000,000 individuals (Wetlands International 2018).
The overall population trend is uncertain, but the species may tentatively be suspected to be in decline (Wetlands International 2018).
Text account compilers
Westrip, J., Butchart, S., Ekstrom, J.
BirdLife International (2020) Species factsheet: Threskiornis spinicollis. Downloaded from http://www.birdlife.org on 04/08/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 04/08/2020.