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

Taxonomic note
Monotypic.

Taxonomic source(s)
Brooks, T. 2000. Extinct species. In: BirdLife International (ed.), Threatened Birds of the World, pp. 701-708. Lynx Edicions and BirdLife International, Barcelona and Cambridge, U.K.
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
D	D	D1

Red List history

Year	Category	Criteria
2024	Extinct
2016	Extinct
2012	Extinct
2008	Extinct
2004	Extinct
2000	Extinct
1994	Extinct
1988	Extinct

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

	Estimate	Data quality
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	0 mature individuals	good	estimated	-
Population trend		-	-	-
Generation length	10.6 years	-	-	-

Population justification: No extant population remains.

Trend justification: Little is known about this species, known only from subfossil bones (Hume 2017). The decline of this species is inferred from the diminishing presence of subfossil remains in more recent records, suggesting environmental factors led to its decline (Human 2017). However, the arrival of Europeans on St Helena in 1502 and consequentially introduced species likely contributed to the eventual extinction of the species (Hume 2017).

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
St Helena (to UK)	extinct	native	yes

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Dry	possible	unknown
Marine Neritic	Pelagic	suitable	unknown
Marine Oceanic	Bathypelagic (1000-4000m)	suitable	unknown
Marine Oceanic	Epipelagic (0-200m)	suitable	unknown
Marine Oceanic	Mesopelagic (200-1000m)	suitable	unknown
Altitude		Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Unspecified species	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Unknown		Unknown		Past Impact
		Stresses Species disturbance, Reduced reproductive success, Species mortality

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Recommended citation
BirdLife International (2024) Species factsheet: Small Saint Helena Petrel Bulweria bifax. Downloaded from https://datazone.birdlife.org/species/factsheet/small-saint-helena-petrel-bulweria-bifax on 21/12/2024.
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 21/12/2024.