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LC
Masked Booby Sula dactylatra

IUCN Red List history

Year Category
2012 Least Concern
2010 Least Concern

Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type   Average mass -

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 102,000 medium
Extent of Occurrence non-breeding (km2) 128,000,000 medium
Number of locations -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 0
Population trend Decreasing -
Number of subpopulations - - -
Largest subpopulation - - -
Generation length (yrs) 16.3 - - -
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 distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
American Samoa Native Extant       Yes
Anguilla (to UK) Native Extant       Yes
Antigua and Barbuda Native Extant       Yes
Aruba (to Netherlands) Native Extant       Yes
Australia Native Extant       Yes
Bahamas Native Extant       Yes
Barbados Native Extant       Yes
Belize Native Extant       Yes
Bermuda (to UK) Native Extant     Yes  
Bonaire, Sint Eustatius and Saba (to Netherlands) Native Extant       Yes
Brazil Native Extant       Yes
Cape Verde Native Extant       Yes
Cayman Islands (to UK) Native Extant       Yes
Chile Native Extant       Yes
Christmas Island (to Australia) Native Extant       Yes
Cocos (Keeling) Islands (to Australia) Native Extant       Yes
Colombia Native Extant       Yes
Comoros Native Extant       Yes
Cook Islands Native Extant       Yes
Costa Rica Native Extant       Yes
Cuba Native Extant       Yes
Curaçao (to Netherlands) Native Extant       Yes
Dominica Native Extant       Yes
Dominican Republic Native Extant       Yes
Ecuador Native Extant       Yes
Egypt Native Extant       Yes
Eritrea Native Extant       Yes
Fiji Native Extant       Yes
French Polynesia Native Extant       Yes
Grenada Vagrant Extant   Yes    
Guadeloupe (to France) Native Extant       Yes
Guam (to USA) Native Extant   Yes    
Guatemala Native Extant       Yes
Haiti Native Extant       Yes
Honduras Unknown Extant        
India Native Extant       Yes
Indonesia Native Extant       Yes
Iran, Islamic Republic of Native Extant   Yes    
Jamaica Native Extant       Yes
Japan Native Extant       Yes
Kenya Native Extant       Yes
Kiribati Native Extant       Yes
Malaysia Native Extant       Yes
Maldives Vagrant Extant   Yes    
Marshall Islands Native Extant       Yes
Martinique (to France) Native Extant       Yes
Mauritius Native Extant       Yes
Mayotte (to France) Native Extant       Yes
Mexico Native Extant       Yes
Micronesia, Federated States of Native Extant       Yes
Montserrat (to UK) Native Extant       Yes
New Caledonia (to France) Native Extant       Yes
New Zealand Native Extant       Yes
Nicaragua Native Extant       Yes
Norfolk Island (to Australia) Native Extant       Yes
Northern Mariana Islands (to USA) Native Extant       Yes
Oman Native Extant       Yes
Pakistan Native Extant       Yes
Palau Native Extant   Yes    
Panama Native Extant       Yes
Papua New Guinea Native Extant       Yes
Peru Native Extant       Yes
Philippines Native Extant       Yes
Pitcairn Islands (to UK) Native Extant       Yes
Puerto Rico (to USA) Native Extant       Yes
Réunion (to France) Native Extant       Yes
Samoa Native Extant       Yes
São Tomé e Príncipe Native Extant       Yes
Seychelles Native Extant       Yes
Sint Maarten (to Netherlands) Native Extant       Yes
Solomon Islands Native Extant       Yes
Somalia Native Extant       Yes
Spain Vagrant Extant   Yes    
Sri Lanka Native Extant       Yes
St Helena (to UK) Native Extant       Yes
St Kitts and Nevis Native Extant       Yes
St Lucia Native Extant       Yes
St Martin (to France) Native Extant        
St Vincent and the Grenadines Native Extant       Yes
Tanzania Native Extant       Yes
Thailand Native Extant       Yes
Tonga Native Extant       Yes
Trinidad and Tobago Native Extant       Yes
Turks and Caicos Islands (to UK) Native Extant       Yes
Tuvalu Native Extant       Yes
United Arab Emirates Vagrant Extant   Yes    
United States Minor Outlying Islands (to USA) Native Extant       Yes
USA Native Extant       Yes
Venezuela Native Extant       Yes
Vietnam Native Extant        
Virgin Islands (to UK) Native Extant       Yes
Virgin Islands (to USA) Native Extant       Yes
Wallis and Futuna Islands (to France) Native Extant       Yes
Yemen Native Extant       Yes

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Anguilla (to UK) Dog Island site factsheet
Antigua and Barbuda Redonda site factsheet
Australia Raine Island, Moulter and Maclennan Cays site factsheet
Bahamas Booby Rocks and Pirates Bay site factsheet
Brazil Atol das Rocas site factsheet
Chile Isla Rapa Nui site factsheet
Chile Isla Sala y Gómez site factsheet
Chile Islas Desventuradas site factsheet
Indonesia Pulau Manuk site factsheet
Jamaica Pedro Cays and Bank site factsheet
Kiribati Enderbury Island site factsheet
Kiribati Malden Island site factsheet
Kiribati Malden Island Marine site factsheet
Kiribati McKean Island site factsheet
Kiribati McKean Island Marine site factsheet
Kiribati Phoenix Islands Marine site factsheet
Oman Halaaniyaat Islands site factsheet
Seychelles Boudeuse island site factsheet
Seychelles Cosmoledo atoll site factsheet
St Helena (to UK) Boatswainbird Island site factsheet
Trinidad and Tobago St Giles Islands site factsheet
United States Minor Outlying Islands (to USA) Baker Island site factsheet
United States Minor Outlying Islands (to USA) Howland and Baker Marine site factsheet
United States Minor Outlying Islands (to USA) Howland Island site factsheet
United States Minor Outlying Islands (to USA) Jarvis Island site factsheet
United States Minor Outlying Islands (to USA) Jarvis Island Marine site factsheet
USA Northwestern Hawaiian Islands site factsheet
Venezuela Isla La Blanquilla site factsheet
Venezuela Isla La Blanquilla - Marine site factsheet
Virgin Islands (to UK) Anegada: Western salt ponds and coastal areas site factsheet
Virgin Islands (to USA) North-west Cays site factsheet

Habitats & altitude

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 0 - 0 m Occasional altitudinal limits  

Recommended citation
BirdLife International (2014) Species factsheet: Sula dactylatra. Downloaded from http://www.birdlife.org on 22/08/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/08/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Least Concern
Family Sulidae (Gannets, Boobies)
Species name author Lesson, 1831
Population size mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 102,000 km2
Country endemic? No
Links to further information
- Summary information on this species