Animalia > Chordata > Aves > Charadriiformes > Laridae > Larus > Larus schistisagus

Larus schistisagus (Slaty-backed Gull)

Wikipedia Abstract

The slaty-backed gull (Larus schistisagus) is a large white-headed gull that breeds on the western coast of Alaska but travels widely during nonbreeding seasons. It is similar in appearance to the western gull and the glaucous-winged gull. Another alternate name is Pacific gull, though this also applies to a southern hemisphere species, Larus pacificus. Claims have been made as to its (sometimes occasional) presence throughout North America as well as the eastern coast of Asia. On November 3, 2012, an individual was spotted in Finland. The species has only been spotted three times before in Europe.
View Wikipedia Record: Larus schistisagus

EDGE Analysis

Uniqueness Scale: Similiar (0) 
 Unique (100)
Uniqueness & Vulnerability Scale: Similiar & Secure (0) 
 Unique & Vulnerable (100)
ED Score: 1.03745
EDGE Score: 0.711699


Adult Weight [1]  2.917 lbs (1.323 kg)
Breeding Habitat [2]  Coastal cliffs and islands, Coastal marine
Wintering Geography [2]  Pacific Coast
Wintering Habitat [2]  Beaches and estuaries, Coastal marine
Diet [3]  Carnivore (Invertebrates), Carnivore (Vertebrates), Piscivore, Frugivore
Diet - Endothermic [3]  10 %
Diet - Fish [3]  30 %
Diet - Fruit [3]  10 %
Diet - Invertibrates [3]  30 %
Diet - Scavenger [3]  20 %
Forages - Ground [3]  30 %
Forages - Water Surface [3]  40 %
Forages - Underwater [3]  30 %
Clutch Size [4]  3
Clutches / Year [4]  1
Global Population (2017 est.) [2]  340,000
Wing Span [4]  4.592 feet (1.4 m)


Protected Areas

Important Bird Areas

Biodiversity Hotspots

Name Location Endemic Species Website
Japan Japan No

Prey / Diet

Empetrum nigrum (black crowberry)[4]
Sardinops sagax (Australian pilchard)[4]

Prey / Diet Overlap


Haliaeetus pelagicus (Steller's Sea-Eagle)[5]


Range Map


North America; Oceania;

External References



Attributes / relations provided by
1Gibbs, D., E. Barnes, and J. Cox. 2001. Pigeons and Doves: A Guide to the Pigeons and Doves of the World. Yale University Press, New Haven, Connecticut
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
4del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
5Diet of the Steller’s Sea Eagle in the Northern Sea of Okhotsk, Irina UTEKHINA, Eugene POTAPOV & Michael J. MCGRADY, First Symposium on Steller’s and White-tailed Sea Eagles in East Asia pp. 71-82, 2000
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