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 common throughout most of its range (del Hoyo et al. 1999).
The population trend has not been quantified directly. A remote sensing study found that tree cover within the range has been lost at a rate of up to 21% over three generations (11.5 years; Global Forest Watch 2022, using Hansen et al.  data and methods disclosed therein). As the species also occupies edge habitat, plantations and open woodland (Wells and Kirwan 2020), population declines are likely lower than the rate of tree cover loss. Nevertheless, hunting may contribute to local declines (Wells and Kirwan 2020). Therefore, the rate of population decline is here tentatively placed in the band 10-19% over three generations.
The species is threatened by the loss of forests within the range. It is moreover hunted in parts of the range (Wells and Kirwan 2020).
Text account compilers
Butchart, S., Dahal, P.R. & Ekstrom, J.
BirdLife International (2023) Species factsheet: Hemiprocne longipennis. Downloaded from http://datazone.birdlife.org/species/factsheet/grey-rumped-treeswift-hemiprocne-longipennis on 04/06/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://datazone.birdlife.org on 04/06/2023.