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). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, 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 global population size has not been quantified, but the species is reported to be locally common (del Hoyo et al. 2001).
Although it has been claimed to be restricted to pristine forest (del Hoyo et al. 2001), closely related H. hartlaubi is reportedly more common in open-canopy, logged forest than in mature, closed-canopy forest (F. Dowsett-Lemaire in litt. 2013) and is not thought to be threatened by hunting (H. Rainey in litt. 2013). Nevertheless, it is suspected to be undergoing some declines overall owing to ongoing habitat destruction and fragmentation.
Text account compilers
Butchart, S., Ekstrom, J., Symes, A. & Taylor, J.
BirdLife International (2022) Species factsheet: Horizocerus granti. Downloaded from http://www.birdlife.org on 02/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 02/12/2022.