Apus pacificus


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Apus pacificus
Species Authority: (Latham, 1802)
Common Name(s):
English Pacific Swift, Pacific Swift
French Martinet de Sibérie
Taxonomic Notes: Apus pacificus is split into A. pacificus, A. cooki, A. salimali and A. leuconyx by Leader (2011), however the BLTWG do not consider that the evidence assembled is not fully presented and compared, and an examination of material in BMNH, which Leader also used, failed to confirm certain plumage differences itemised in his paper as (a) consistent and in some cases (b) existent (for example, he tabulates [p.83] the underwing-coverts of cooki as ‘black and contrasting with the rest of underwing’ and of leuconyx as ‘dark brown and similar in colour to rest of underwing’, but in birds we examined we could not detect this distinction). Leader refers to ‘clear’ differences in voice between the taxa he seeks to split, and we think it is necessary to produce this evidence to reinforce the morphological distinctions that can legitimately be itemised.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Facilitator/Compiler(s): Ekstrom, J., Butchart, S.
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 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.

Geographic Range [top]

Australia; Bangladesh; Bhutan; Cambodia; China; Christmas Island; Guam; Hong Kong; India; Indonesia; Japan; Kazakhstan; Korea, Democratic People's Republic of; Korea, Republic of; Lao People's Democratic Republic; Malaysia; Marshall Islands; Mongolia; Myanmar; Nepal; Northern Mariana Islands; Pakistan; Papua New Guinea; Philippines; Russian Federation; Singapore; Taiwan, Province of China; Thailand; Timor-Leste; Viet Nam
Brunei Darussalam; Maldives; New Zealand; Seychelles; Sri Lanka; United Arab Emirates; United Kingdom; United States
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The global population size has not been quantified, but the species is reported to be generally common throughout most of its breeding range except Pakistan (del Hoyo et al. 1999). National population estimates include: < c.10,000 breeding pairs and c.1,000-10,000 individuals on migration in China; c.100-10,000 breeding pairs and c.50-1,000 individuals on migration in Taiwan; c.100-100,000 breeding pairs and c.50-10,000 individuals on migration in Korea; c.10,000-100,000 breeding pairs and c.1,000-10,000 individuals on migration in Japan and c.10,000-100,000 breeding pairs and c.1,000-10,000 individuals on migration in Russia (Brazil 2009).
Population Trend: Stable

Habitat and Ecology [top]

Systems: Terrestrial

Citation: BirdLife International 2012. Apus pacificus. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 29 August 2015.
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