Animalia > Chordata > Aves > Charadriiformes > Laridae > Larus > Larus thayeri

Larus thayeri (Thayer's Gull)

Language: French; Spanish

Wikipedia Abstract

Thayer's gull (Larus thayeri) is a large gull native to North America that breeds in the Arctic islands of Canada and winters primarily on the Pacific coast, from southern Alaska to the Gulf of California, though there are also wintering populations on the Great Lakes and the upper Mississippi River. The species has occurred as a vagrant to Japan, Denmark, and other parts of western Europe. Both the common and species names honor ornithologist John Eliot Thayer, and so the first part of its name is pronounced "THAY-erz".
View Wikipedia Record: Larus thayeri

EDGE Analysis

Uniqueness Scale: Similiar (0) 
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
 Unique & Vulnerable (100)
ED Score: 1.01529
EDGE Score: 0.700761


Adult Weight [1]  2.205 lbs (1.00 kg)
Male Weight [5]  2.251 lbs (1.021 kg)
Breeding Habitat [2]  Arctic coastal
Wintering Geography [2]  Pacific Coast
Wintering Habitat [2]  Beaches and estuaries, Coastal marine, Freshwater lakes and rivers
Diet [3]  Carnivore (Invertebrates), Carnivore (Vertebrates), Piscivore
Diet - Fish [3]  40 %
Diet - Invertibrates [3]  30 %
Diet - Scavenger [3]  30 %
Forages - Ground [3]  20 %
Forages - Water Surface [3]  80 %
Global Population (2017 est.) [2]  18,000
Migration [4]  Intracontinental
Wing Span [1]  4.428 feet (1.35 m)


Protected Areas

Important Bird Areas

Name Location  IBA Criteria   Website   Climate   Land Use 
Baynes Sound Canada A4i
Cowichan estuary Canada A4i
Little Qualicum Estuary to Nanoose Bay Canada A4i, A4iii
Mendenhall Wetlands USA A4i

Biodiversity Hotspots

Name Location Endemic Species Website
California Floristic Province Mexico, United States No


Parasitized by 
Paracuaria adunca <Unverified Name>[6]
Streptocara crassicauda <Unverified Name>[6]

Range Map


North America;

External References



Attributes / relations provided by
1del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
2Partners in Flight Avian Conservation Assessment Database, version 2017. Accessed on January 2018.
3Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014. EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
4Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed February 01, 2010 at
5Snell, RR 2002: Iceland gull, Larus glaucoides, Thayer's gull, Larus thayeri. The Birds of North America (A. Poole & F. Gill eds) 699. Philadelphia: The Birds of North America, Inc.
6Gibson, D. I., Bray, R. A., & Harris, E. A. (Compilers) (2005). Host-Parasite Database of the Natural History Museum, London
Ecoregions provided by World Wide Fund For Nature (WWF). WildFinder: Online database of species distributions, ver. 01.06 WWF WildFINDER
Biodiversity Hotspots provided by Critical Ecosystem Partnership Fund
Abstract provided by DBpedia licensed under a Creative Commons License