Data Zone
Taxonomic note
Sula dactylatra (AOU 1998 + updates) and Sula tasmani (Christidis and Boles 1994) have been lumped as S. dactylatra following Christidis and Boles (2008).
Taxonomic source(s)
Christidis, L. and Boles, W.E. 2008. Systematics and Taxonomy of Australian Birds. CSIRO Publishing, Collingwood, Australia.
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.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2018 | Least Concern | |
| 2016 | Least Concern | |
| 2012 | Least Concern | |
| 2010 | Least Concern | |
| 2008 | Not Recognised | |
| 2004 | Not Recognised | |
| 2000 | Not Recognised | |
| 1994 | Not Recognised | |
| 1988 | Not Recognised |
| Migratory status | not a migrant | Forest dependency | does not normally occur in forest |
| Land-mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 211,000,000 km2 | medium |
| Extent of Occurrence (non-breeding) | 128,000,000 km2 | medium |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | unknown | - | - | - |
| Population trend | decreasing | - | inferred | - |
| Generation length | 16.3 years | - | - | - |
Population justification: The global population size has not been quantified, but this species is described as 'fairly common' (Stotz et al. 1996).
Trend justification: The population is suspected to be in decline owing to predation by invasive species and unsustainable levels of exploitation.
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| American Samoa | extant | native | yes | |||
| Anguilla (to UK) | extant | native | yes | |||
| Antigua and Barbuda | extant | native | yes | |||
| Aruba (to Netherlands) | extant | native | yes | |||
| Australia | extant | native | yes | |||
| Bahamas | extant | native | yes | |||
| Barbados | extant | native | yes | |||
| Belize | extant | native | yes | |||
| Bermuda (to UK) | extant | native | yes | |||
| Bonaire, Sint Eustatius and Saba (to Netherlands) | extant | native | yes | |||
| Brazil | extant | native | yes | |||
| Cape Verde | extant | native | yes | |||
| Cayman Islands (to UK) | extant | native | yes | |||
| Chile | extant | native | yes | |||
| Christmas Island (to Australia) | extant | native | yes | |||
| Cocos (Keeling) Islands (to Australia) | extant | native | yes | |||
| Colombia | extant | native | yes | |||
| Comoros | extant | native | yes | |||
| Cook Islands | extant | native | yes | |||
| Costa Rica | extant | native | yes | |||
| Cuba | extant | native | yes | |||
| Curaçao (to Netherlands) | extant | native | yes | |||
| Dominica | extant | native | yes | |||
| Dominican Republic | extant | native | yes | |||
| Ecuador | extant | native | yes | |||
| Egypt | extant | native | yes | |||
| Eritrea | extant | native | yes | |||
| Fiji | extant | native | yes | |||
| French Polynesia | extant | native | yes | |||
| Grenada | extant | vagrant | yes | |||
| Guadeloupe (to France) | extant | native | yes | |||
| Guam (to USA) | extant | native | yes | |||
| Guatemala | extant | native | yes | |||
| Haiti | extant | native | yes | |||
| Honduras | extant | uncertain | ||||
| India | extant | native | yes | |||
| Indonesia | extant | native | yes | |||
| Iran, Islamic Republic of | extant | native | yes | |||
| Jamaica | extant | native | yes | |||
| Japan | extant | native | yes | |||
| Kenya | extant | native | yes | |||
| Kiribati | extant | native | yes | |||
| Malaysia | extant | native | yes | |||
| Maldives | extant | vagrant | yes | |||
| Marshall Islands | extant | native | yes | |||
| Martinique (to France) | extant | native | yes | |||
| Mauritius | extant | native | yes | |||
| Mayotte (to France) | extant | native | yes | |||
| Mexico | extant | native | yes | |||
| Micronesia, Federated States of | extant | native | yes | |||
| Montserrat (to UK) | extant | native | yes | |||
| New Caledonia (to France) | extant | native | yes | |||
| New Zealand | extant | native | yes | |||
| Nicaragua | extant | native | yes | |||
| Norfolk Island (to Australia) | extant | native | yes | |||
| Northern Mariana Islands (to USA) | extant | native | yes | |||
| Oman | extant | native | yes | |||
| Pakistan | extant | native | yes | |||
| Palau | extant | native | yes | |||
| Panama | extant | native | yes | |||
| Papua New Guinea | extant | native | yes | |||
| Peru | extant | native | yes | |||
| Philippines | extant | native | yes | |||
| Pitcairn Islands (to UK) | extant | native | yes | |||
| Puerto Rico (to USA) | extant | native | yes | |||
| Réunion (to France) | extant | native | yes | |||
| Samoa | extant | native | yes | |||
| São Tomé e Príncipe | extant | native | yes | |||
| Seychelles | extant | native | yes | |||
| Sint Maarten (to Netherlands) | extant | native | yes | |||
| Solomon Islands | extant | native | yes | |||
| Somalia | extant | native | yes | |||
| Spain | extant | vagrant | yes | |||
| Sri Lanka | extant | native | yes | |||
| St Helena (to UK) | extant | native | yes | |||
| St Kitts and Nevis | extant | native | yes | |||
| St Lucia | extant | native | yes | |||
| St Martin (to France) | extant | native | ||||
| St Vincent and the Grenadines | extant | native | yes | |||
| Tanzania | extant | native | yes | |||
| Thailand | extant | native | yes | |||
| Tonga | extant | native | yes | |||
| Trinidad and Tobago | extant | native | yes | |||
| Turks and Caicos Islands (to UK) | extant | native | yes | |||
| Tuvalu | extant | native | yes | |||
| United Arab Emirates | extant | vagrant | yes | |||
| United States Minor Outlying Islands (to USA) | extant | native | yes | |||
| USA | extant | native | yes | |||
| Venezuela | extant | native | yes | |||
| Vietnam | extant | native | ||||
| Virgin Islands (to UK) | extant | native | yes | |||
| Virgin Islands (to USA) | extant | native | yes | |||
| Wallis and Futuna Islands (to France) | extant | native | yes | |||
| Yemen | extant | native | yes |
| Country/Territory | IBA Name |
|---|---|
| Anguilla (to UK) | Dog Island |
| Antigua and Barbuda | Redonda |
| Australia | Raine Island, Moulter and Maclennan Cays |
| Bahamas | Booby Rocks and Pirates Bay |
| Brazil | Atol das Rocas |
| French Polynesia | Clipperton |
| French Polynesia | Clipperton Marine |
| French Southern Territories | Tromelin |
| Indonesia | Pulau Manuk |
| Jamaica | Pedro Cays and Bank |
| Kiribati | Enderbury Island |
| Kiribati | Malden Island |
| Kiribati | Malden Island Marine |
| Kiribati | McKean Island |
| Kiribati | McKean Island Marine |
| Kiribati | Phoenix Islands Marine |
| Oman | Halaaniyaat Islands |
| Puerto Rico (to USA) | Mona and Monito |
| Seychelles | Boudeuse Island |
| Seychelles | Cosmoledo |
| St Helena (to UK) | Boatswainbird Island |
| St Helena (to UK) | Letterbox Peninsula |
| Tanzania | Latham Island |
| Trinidad and Tobago | St Giles Islands |
| United States Minor Outlying Islands (to USA) | Baker Island |
| United States Minor Outlying Islands (to USA) | Howland and Baker Marine |
| United States Minor Outlying Islands (to USA) | Howland Island |
| United States Minor Outlying Islands (to USA) | Jarvis Island |
| United States Minor Outlying Islands (to USA) | Jarvis Island Marine |
| USA | Northwestern Hawaiian Islands |
| Venezuela | Isla La Blanquilla |
| Venezuela | Isla La Blanquilla - Marine |
| Virgin Islands (to UK) | Anegada: Western salt ponds and coastal areas |
| Virgin Islands (to USA) | North-west Cays |
| Yemen | Darsa |
| Yemen | Kal Farun (Socotra) |
| Yemen | Sabuniya (Socotra) |
| Yemen | Samha |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Marine Intertidal | Sandy Shoreline and/or Beaches, Sand Bars, Spits, Etc | major | resident |
| Marine Intertidal | Shingle and/or Pebble Shoreline and/or Beaches | major | resident |
| Marine Neritic | Macroalgal/Kelp | major | resident |
| Marine Neritic | Pelagic | major | resident |
| Marine Neritic | Seagrass (Submerged) | major | resident |
| Marine Neritic | Subtidal Loose Rock/pebble/gravel | major | resident |
| Marine Neritic | Subtidal Rock and Rocky Reefs | major | resident |
| Marine Neritic | Subtidal Sandy | major | resident |
| Marine Neritic | Subtidal Sandy-Mud | major | resident |
| Marine Oceanic | Epipelagic (0-200m) | major | resident |
| Marine Oceanic | Mesopelagic (200-1000m) | major | resident |
| 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 | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
|||||||||
| Human intrusions & disturbance | Recreational activities | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Negligible declines | Low Impact: 4 | ||||||
|
|||||||||
| Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Rattus rattus | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Negligible declines | Low Impact: 4 | ||||||
|
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Recommended citation
BirdLife International (2024) Species factsheet: Masked Booby Sula dactylatra. Downloaded from
https://datazone.birdlife.org/species/factsheet/masked-booby-sula-dactylatra on 04/12/2024.
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 04/12/2024.