• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2023	Data Deficient
2016	Data Deficient
2012	Data Deficient
2008	Data Deficient
2004	Data Deficient
2000	Data Deficient
1996	Data Deficient
1994	Data Deficient
1988	Threatened

Migratory status	not a migrant	Forest dependency	medium
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	93 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	unknown	-	-	-
Generation length	4.75 years	-	-	-

Population justification: The population size of this species cannot currently be quantified due to the uncertainty over the delimitation of the species' range. If it is restricted to the island of Bioko there are records possibly relating to this species from several high altitude sites, with maximum flock sizes of fewer than 50 individuals. Therefore there is the possibility that the population is small or very small. Equally, if individuals reported in Cameroon, mainland Equatorial Guinea and Angola (Dowsett-Lemaire and Dowsett 1999, Bowden 2001, Mills and Dean 2007, Cooper et al. 2016), currently treated as unidentified (Cooper et al. 2017), are this species, then the population is plausibly large and secure. There is no information on trends from any part of the potential range.

Trend justification: The population trend is unknown: there is no information even from restricted areas of the plausible range such as Bioko.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Angola	presence uncertain	native
Cameroon	presence uncertain	native
Equatorial Guinea	extant	native		yes
Nigeria	presence uncertain	vagrant

Country/Territory	IBA Name
Cameroon	Bakossi mountains

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Montane	suitable	resident
Altitude	1000 - 2000 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Unknown		Unknown		Unknown
		Stresses Ecosystem degradation

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Recommended citation
BirdLife International (2024) Species factsheet: Fernando Po Swift Apus sladeniae. Downloaded from https://datazone.birdlife.org/species/factsheet/fernando-po-swift-apus-sladeniae on 23/11/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 23/11/2024.