Data Zone
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.
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. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2016 | Extinct | |
| 2012 | Extinct | |
| 2008 | Extinct | |
| 2004 | Extinct | |
| 2000 | Extinct | |
| 1994 | Extinct | |
| 1988 | Extinct |
| Migratory status | not a migrant | Forest dependency | unset |
| Land mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Number of locations | - | |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | 0 | |||
| Population trend | not applicable | - | ||
| Decline (3 years/1 generation past) | - | - | - | |
| Decline (5 years/1 generation past) | - | - | - | |
| Decline (10 years/1 generation past) | - | - | - | |
| Decline (10 years/3 generation future) | - | - | - | |
| Decline (10 years/3 generation past and future) | - | - | - | |
| Number of subpopulations | - | - | - | |
| Percentage in largest subpopulation | - | - | - | |
| Generation length (yrs) | 23.9 | - | - | - |
Population justification: None remain.
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| St Helena (to UK) | N | Extinct | Yes |
| Country/Territory | IBA Name |
|---|
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Forest | Subtropical/Tropical Dry | major | breeding |
| Marine Neritic | Pelagic | major | resident |
| Marine Oceanic | Epipelagic (0-200m) | major | resident |
| Marine Oceanic | Mesopelagic (200-1000m) | major | resident |
| Shrubland | Subtropical/Tropical Dry | major | breeding |
| Altitude | Occasional altitudinal limits |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Biological resource use | Hunting & trapping terrestrial animals - Intentional use (species is the target) | Timing | Scope | Severity | Impact | ||||
| Past, Unlikely to Return | Whole (>90%) | Rapid Declines | Past Impact | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Capra hircus | Timing | Scope | Severity | Impact | ||||
| Past, Unlikely to Return | Whole (>90%) | Unknown | Past Impact | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Felis catus | Timing | Scope | Severity | Impact | ||||
| Past, Unlikely to Return | Whole (>90%) | Unknown | Past Impact | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Named species | Timing | Scope | Severity | Impact | ||||
| Past, Unlikely to Return | Whole (>90%) | Unknown | Past Impact | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Sus scrofa | Timing | Scope | Severity | Impact | ||||
| Past, Unlikely to Return | Whole (>90%) | Unknown | Past Impact | ||||||
|
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Recommended citation
BirdLife International (2023) Species factsheet: Bulweria bifax. Downloaded from
http://www.birdlife.org on 21/03/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 21/03/2023.
