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). The population trend appears to be stable, 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 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 210,000-360,000 mature individuals (Wetlands International 2020).
The population in Central and South America is thought to be stable, while the population in North America is increasing (Rosenberg et al. 2019; Wetlands International 2020). In North America, the population has increased by about 65% over the past three generations (23 years, Pardieck et al. 2018). Overall, the population is here tentatively assessed as stable.
Text account compilers
Bell, F., Hermes, C.
Butchart, S. & Ekstrom, J.
BirdLife International (2023) Species factsheet: Eudocimus albus. Downloaded from http://datazone.birdlife.org/species/factsheet/white-ibis-eudocimus-albus on 26/09/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://datazone.birdlife.org on 26/09/2023.