| Citation |
BirdLife International. 2018. Collocalia troglodytes. The IUCN Red List of Threatened Species 2018: e.T22686504A130107820. https://dx.doi.org/10.2305/IUCN.UK.2018-2.RLTS.T22686504A130107820.en. Accessed on 04 April 2022. Brinkman, J.J., van der Ven, W., Allen, D., Hutchinson, R., Jensen, A.E., Perez, C. (2021): Checklist of birds of the Philippines. Wild Bird Club of the Philippines. www.birdwatch.ph |
Description |
JUSTIFICATION
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). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the threshold for Vulnerable under the population trend criterion (>30% decline over ten years of 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.
DESCRIPTION
The global population size has not been quantified, but the species is reported to be fairly common to common (del Hoyo et al. 1999).
Trend Justification:
The species is tentatively assessed as being in decline due to habitat loss per Tracewski et al. (2016). |
