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Wedge-tailed Shearwater Ardenna pacifica

IUCN Red List history

Year Category
2012 Least Concern
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern

Species attributes

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


  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 115,000,000
Number of locations -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals poor Estimated 2009
Population trend Decreasing -
Number of subpopulations - - -
Largest subpopulation - - -
Generation length (yrs) 16.5 - - -
Population justification: Brooke (2004) estimated the global population to number > c.5,200,000 individuals, while national population sizes have been estimated at c.50-10,000 individuals on migration in Taiwan and c.10,000-100,000 breeding pairs and c.1,000-10,000 individuals on migration in Japan (Brazil 2009).
Trend justification: The population is suspected to be in decline owing to unsustainable levels of exploitation, persecution, predation by invasive species and the over-exploitation of tuna fisheries (Brooke 2004).

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
American Samoa Unknown Extant        
Australia Native Extant        
British Indian Ocean Territory Native Extant Yes      
Chile Unknown Extant        
China (mainland) Native Extant        
Christmas Island (to Australia) Vagrant Extant        
Cocos (Keeling) Islands (to Australia) Native Extant Yes      
Colombia Native Extant        
Comoros Unknown Extant        
Cook Islands Unknown Extant        
Costa Rica Vagrant Extant   Yes    
Ecuador Native Extant        
Egypt Vagrant Extant        
El Salvador Unknown Extant        
Fiji Native Extant Yes      
French Polynesia Native Extant Yes      
French Southern Territories Unknown Extant        
Guam (to USA) Native Extant   Yes    
Guatemala Native Extant        
Honduras Native Extant        
India Native Extant        
Indonesia Native Extant        
Iran, Islamic Republic of Vagrant Extant   Yes    
Japan Native Extant        
Kenya Native Extant        
Kiribati Native Extant Yes      
Madagascar Native Extant        
Malaysia Native Extant        
Maldives Native Extant        
Marshall Islands Native Extant Yes      
Mauritius Native Extant Yes      
Mayotte (to France) Unknown Extant        
Mexico Native Extant        
Micronesia, Federated States of Native Extant   Yes    
Mozambique Native Extant        
Nauru Unknown Extant        
New Caledonia (to France) Native Extant        
New Zealand Vagrant Extant        
Nicaragua Native Extant        
Niue (to New Zealand) Unknown Extant        
Norfolk Island (to Australia) Native Extant        
Northern Mariana Islands (to USA) Native Extant Yes      
Oman Native Extant   Yes    
Pakistan Unknown Extant        
Palau Native Extant   Yes    
Panama Vagrant Extant        
Papua New Guinea Native Extant        
Peru Unknown Extant        
Philippines Native Extant        
Pitcairn Islands (to UK) Unknown Extant        
Réunion (to France) Native Extant        
Samoa Native Extant Yes      
Seychelles Native Extant Yes      
Solomon Islands Native Extant Yes      
Somalia Native Extant        
South Africa Unknown Extant        
Sri Lanka Native Extant        
Taiwan (China) Native Extant        
Tanzania Unknown Extant        
Tokelau (to New Zealand) Unknown Extant        
Tonga Native Extant        
Tuvalu Unknown Extant        
United States Minor Outlying Islands (to USA) Native Extant Yes      
USA Native Extant Yes      
Vanuatu Native Extant        
Wallis and Futuna Islands (to France) Unknown Extant        
Yemen Native Extant   Yes    

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Australia Capricornia Cays site factsheet
Australia Coringa-Herald Reefs site factsheet
Australia Houtman Abrolhos site factsheet
Australia Lord Howe Island Permanent Park Preserve (Lord Howe Island IBA) site factsheet
Mauritius Round Island site factsheet
New Caledonia (to France) Île Kotomo site factsheet
New Caledonia (to France) Îles des récifs Bampton et Chesterfield site factsheet
New Caledonia (to France) Îlots du lagon sud site factsheet
New Caledonia (to France) Îlots du Nord-Ouest site factsheet
Norfolk Island (to Australia) Norfolk Island site factsheet
Seychelles Aride island site factsheet
Seychelles Cousin island site factsheet
Seychelles Cousine island site factsheet
Tonga 'Ata Island site factsheet
Tonga Ata Island Marine site factsheet
USA Kilauea Point National Wildlife Refuge site factsheet
USA Lehua Islet site factsheet
USA Lehua Islet site factsheet
USA Northwestern Hawaiian Islands site factsheet
Vanuatu Tongoa - Laika site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Marine Coastal/Supratidal Sea Cliffs and Rocky Offshore Islands suitable breeding
Marine Neritic Macroalgal/Kelp major breeding
Marine Neritic Macroalgal/Kelp major non-breeding
Marine Neritic Pelagic major breeding
Marine Neritic Pelagic major non-breeding
Marine Neritic Seagrass (Submerged) major breeding
Marine Neritic Seagrass (Submerged) major non-breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel major breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel major non-breeding
Marine Neritic Subtidal Rock and Rocky Reefs major breeding
Marine Neritic Subtidal Rock and Rocky Reefs major non-breeding
Marine Neritic Subtidal Sandy major breeding
Marine Neritic Subtidal Sandy major non-breeding
Marine Neritic Subtidal Sandy-Mud major breeding
Marine Neritic Subtidal Sandy-Mud major non-breeding
Marine Oceanic Epipelagic (0-200m) major breeding
Marine Oceanic Epipelagic (0-200m) major non-breeding
Marine Oceanic Mesopelagic (200-1000m) major breeding
Marine Oceanic Mesopelagic (200-1000m) major non-breeding
Altitude 0 - 100 m Occasional altitudinal limits  


Purpose Primary form used Life stage used Source Scale Level Timing
Food (human) Whole Adults and juveniles Wild Subsistence, National Non-trivial Recent

Recommended citation
BirdLife International (2016) Species factsheet: Ardenna pacifica. Downloaded from on 11/02/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 11/02/2016.

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 Procellariidae (Petrels, Shearwaters)
Species name author (Gmelin, 1789)
Population size mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 115,000,000 km2
Country endemic? No
Links to further information
- Summary information on this species