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LC
Glaucous-winged Gull Larus glaucescens

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 -

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 707,000
Extent of Occurrence non-breeding (km2) 5,330,000
Number of locations -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals poor Estimated 2009
Population trend Increasing -
Number of subpopulations - - -
Largest subpopulation - - -
Generation length (yrs) 12.9 - - -
Population justification: The global population is estimated to number > c.570,000 individuals (Wetlands International 2006), while the population in Russia has been estimated at c.100-10,000 breeding pairs and c.50-1,000 individuals on migration (Brazil 2009).
Trend justification: The overall population trend is increasing (Wetlands International 2006), although some populations are stable. This species has had stable population trends over the last 40 years in North America (data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007).

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Canada Native Extant     Yes Yes
China (mainland) Vagrant Extant        
Hong Kong (China) Vagrant Extant        
Japan Native Extant        
Mexico Native Extant        
Morocco Vagrant Extant        
Russia (Asian) Native Extant        
Spain Vagrant Extant        
USA Native Extant Yes      

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Canada Baynes Sound site factsheet
Canada Boundary Bay - Roberts Bank - Sturgeon Bank (Fraser River Estuary) site factsheet
Canada Chain Islets and Great Chain Islet site factsheet
Canada Kyuquot Channel Islets site factsheet
Canada Lambert Channel/Hornby Island Waters site factsheet
USA Agattu Island Colonies site factsheet
USA Attu Island Colony site factsheet
USA Bering Sea Shelf Edge 168W56N site factsheet
USA Bering Sea Shelf Edge 169W55N site factsheet
USA Buldir & Near Islands Marine site factsheet
USA Copper River Delta site factsheet
USA Fenimore Pass & Atka Island Marine site factsheet
USA Kachemak Bay site factsheet
USA Kiska Island Colonies site factsheet
USA Kiska Island Marine site factsheet
USA Lower Cook Inlet 153W59N site factsheet
USA Northern Montague Island site factsheet
USA Prince William Sound site factsheet
USA Unimak & Akutan Passes site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Urban Areas suitable breeding
Grassland Temperate suitable breeding
Marine Coastal/Supratidal Sea Cliffs and Rocky Offshore Islands major breeding
Marine Intertidal Rocky Shoreline suitable breeding
Marine Intertidal Rocky Shoreline suitable non-breeding
Marine Intertidal Tidepools suitable breeding
Marine Intertidal Tidepools suitable non-breeding
Marine Neritic Estuaries suitable breeding
Marine Neritic Estuaries suitable non-breeding
Marine Neritic Macroalgal/Kelp suitable breeding
Marine Neritic Macroalgal/Kelp suitable non-breeding
Marine Neritic Pelagic suitable breeding
Marine Neritic Pelagic suitable non-breeding
Marine Neritic Seagrass (Submerged) suitable breeding
Marine Neritic Seagrass (Submerged) suitable non-breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel suitable breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel suitable non-breeding
Marine Neritic Subtidal Rock and Rocky Reefs suitable breeding
Marine Neritic Subtidal Rock and Rocky Reefs suitable non-breeding
Marine Neritic Subtidal Sandy suitable breeding
Marine Neritic Subtidal Sandy suitable non-breeding
Marine Neritic Subtidal Sandy-Mud suitable breeding
Marine Neritic Subtidal Sandy-Mud suitable non-breeding
Rocky areas (eg. inland cliffs, mountain peaks) major breeding
Wetlands (inland) Permanent Freshwater Lakes (over 8ha) suitable breeding
Altitude 0 - 0 m Occasional altitudinal limits  

Recommended citation
BirdLife International (2014) Species factsheet: Larus glaucescens. Downloaded from http://www.birdlife.org on 22/12/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/12/2014.

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 Laridae (Gulls, Terns, Skimmers)
Species name author Naumann, 1840
Population size mature individuals
Population trend Increasing
Distribution size (breeding/resident) 707,000 km2
Country endemic? No
Links to further information
- Summary information on this species