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 may be small, 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 population is estimated to number 1,000-10,000 individuals, roughly equating to 670-6,700 mature individuals.
The population is suspected to be stable in the absence of evidence for any declines or substantial threats.
The species is vulnerable to habitat loss, degradation of woodland and direct persecution (due to its habit of preying on racing pigeons and other birds [Hartley and Mundy 2003]) in parts of its range (Kemp and Boesman 2013, Global Raptor Information Network 2015). It may also be vulnerable to pesticide contamination (Global Raptor Information Network 2015).
Text account compilers
Butchart, S., Harding, M., Ekstrom, J., Ashpole, J
BirdLife International (2020) Species factsheet: Hieraaetus ayresii. Downloaded from http://www.birdlife.org on 03/04/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 03/04/2020.