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Larus cachinnans

(Yellow-Legged Gull)

Overview:

Conservation Status

Population Analysis

  • For the 56,576 species in the Class Aves (Birds), we average 371.87 observations each in our database; for the Yellow-Legged Gull, we have 5,959 observations. Compared to other species in this Class, this species is moderately common.
  • A two-sample t-test can be used to determine whether the trend in observations of the Yellow-Legged Gull is the same as the trend in observations of Aves. Is this species just as common, as a proportion of all observations, as it once was? The answer is yes, changes in observation rate of this species do not significantly differ from changes in observation rate of its Class.

History:

  • 1988-Lower Risk/least concern (BirdLife International 2004)
  • 1994-Lower Risk/least concern (BirdLife International 2004)
  • 2000-Lower Risk/least concern (BirdLife International 2000)

Justification

This species has a large range, with an estimated global extent of occurrence of 1,000,000¿10,000,000 km². It has a large global population estimated to be 770,000¿1,800,000 individuals (Wetlands International 2002). Global population trends have not been quantified, but the species is not believed to approach the thresholds for the population decline criterion of the IUCN Red List (i.e., declining more than 30% in ten years or three generations). For these reasons, the species is evaluated as Least Concern.

Taxonomy

  • Domain: Eukaryota Whittaker & Margulis,1978 - eukaryotes
    • Kingdom: Animalia Linnaeus, 1758 - Linnaeus, 1758 - animals
      • Subkingdom: Bilateria (Hatschek, 1888) Cavalier-Smith, 1983 - (Hatschek, 1888) Cavalier-Smith, 1983 - bilaterians

Notes:

Name Status: Accepted Name. Latest taxonomic scrutiny: 17-Oct-2001

Physical Description

Family Laridae:

Medium to large birds, usually grey or white, often with black markings on the head or wings. They have stout, longish bills, and webbed feet.

Adult:

Head: white Bill: yellow. Red spot on lower mandible, and sometimes upper mandible Lower Mandible: yellow with red spot Neck: white Body: Back: medium gray Breast: white Underparts: white Legs: Foot Color: yellow Leg Color: yellow Tail: white.

Size/Age/Growth:

About 24 inches long, with a wingspan of 54 to 57 inches. Adults weigh about 44.8 ounces.

Distribution

Range and Population

This species has a large range, with an estimated global Extent of Occurrence of 1,000,000-10,000,000 km². It has a large global population estimated to be 770,000-1,800,000 individuals (Wetlands International 2002). Global population trends have not been quantified, but the species is not believed to approach the thresholds for the population decline criterion of the IUCN Red List (i.e. declining more than 30% in ten years or three generations). For these reasons, the species is evaluated as Least Concern.

North America

Migration

Migratory

Similar Species

Herring Gull

Members of the genus Larus:

There are approximately 189 species and subspecies in this genus. Here are just 100 of them: L. africilla (Laughing Gull) · L. argentatus (Herring Gull) · L. argentatus antelius · L. argentatus argentatus (Herring Gull) · L. argentatus argenteus · L. argentatus atlantis · L. argentatus birulae · L. argentatus cachinnans · L. argentatus drosti · L. argentatus heuglini · L. argentatus hueglini · L. argentatus michahelis · L. argentatus michahelles · L. argentatus michahellis · L. argentatus mongolicus · L. argentatus omissus · L. argentatus smithsonianus · L. argentatus ssp · L. argentatus thayeri · L. argentatus vegae · L. armenicus (Armenian Gull) · L. atlanticus (Olrog's Gull) · L. atricilla (Laughing Gull) · L. atricilla atricilla · L. atricilla megalopterus · L. audouinii (Audouin's Gull) · L. belcheri (Band-Tailed Gull) · L. belcheri atlanticus · L. belcheri belcheri · L. borealis · L. brachyrhynchus · L. brachyrhynchus (Red-Legged Kittiwake) · L. bridgesii · L. brunneicephalus · L. brunnicephalus (Brown-Headed Gull) · L. bulleri (Black-Billed Gull) · L. byperboreus · L. cachin · L. cachinnans (Yellow-Legged Gull) · L. cachinnans atlantis · L. cachinnans barabensis · L. cachinnans cachinanns · L. cachinnans cachinnans · L. cachinnans michahellis · L. cachinnans mongolicus · L. californicus (California Gull) · L. californicus albertaensis · L. californicus californicus · L. californicus ssp · L. canus (Mew Gull) · L. canus brachyrhynchus (Mew Gull) · L. canus canus (Mew Gull) · L. canus heinei (Mew Gull) · L. canus kamtschatschensis · L. capistratus · L. cirrhocephalus · L. cirrhocephalus cirrhocephalus · L. cirrocephalus (Grey-Headed Gull) · L. cirrocephalus cirrocephalus · L. cirrocephalus poiocephalus · L. crassirostris (Black-Tailed Gull) · L. delawarenis · L. delawarensis (Ring-Billed Gull) · L. delewarensis · L. dominicanus (Kelp Gull) · L. dominicanus austrinus · L. dominicanus dominicanus · L. dominicanus judithae · L. dominicanus melisandae · L. dominicanus vetula · L. dominicanus vetula (Ivory Gull) · L. eburneus · L. elegans · L. franklerii · L. fuliginosus (Lava Gull) · L. furcatus (Swallow-Tailed Gull) · L. fuscus (Lesser Black-Backed Gull) · L. fuscus antelius · L. fuscus britannicus · L. fuscus fuscus (Lesser Black-Backed Gull) · L. fuscus graellsi · L. fuscus graellsii (Lesser Black-Backed Gull) · L. fuscus heuglini · L. fuscus intermedius · L. gelastes · L. genei (Slender-Billed Gull) · L. glaucescens (Glaucous-Winged Gull) · L. glaucescens californicus · L. glaucescens hybrid · L. glaucescens occidentalis · L. glaucescens x · L. glaucoides (Iceland Gull) · L. glaucoides glaucoides (Iceland Gull) · L. glaucoides kumlieni (Iceland Gull) · L. glaucoides thayeri (Iceland Gull) · L. glaucus · L. haematorhynchus · L. hartlaubi · L. hartlaubii (King Gull) · L. heermanni (Heermann's Gull)

Bibliography

  • Alsop, Fred J. III. Birds of North America - Eastern Region. First American Edition. Smithsonian Handbooks. DK Publishing, Inc. 2001.
  • Banks, R. C., R. W. McDiarmid, A. L. Gardner, and W. C. Starnes 2003. Checklist of Vertebrates of the United States, the U.S. Territories, and Canada.
  • BirdLife International. 2000. Threatened Birds of the World. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, U.K.

More Info

Notes

Contributors:

Data Sources:

Accessed through GBIF Data Portal December 03, 2007:

Identifiers:

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Last Revised: May 04, 2008