Family Gulls, Terns, Skimmers (Laridae)

Near Threatened

Olrog's Gull (Larus atlanticus)


Taxonomy

French: Goéland d’Olrog German: Olrogmöwe Spanish: Gaviota cangrejera
Taxonomy:

Larus belcheri atlanticus

Olrog

, 1958,

Mar del Plata, Argentina

.

Originally described as a race of L. belcheri, but now almost universally considered a distinct species. Monotypic.

Distribution:

Breeds locally in Argentina from S Buenos Aires to C Chubut; in winter, ranges S to Tierra del Fuego and N to Uruguay and S Brazil.

Descriptive notes

50–56 cm; 900–960 g; wingspan 130–140 cm. The breeding adult is white, with a black mantle and wings; the secondaries and inner primaries are broadly... read more

Voice

Produces a range of guttural and nasal "ow" sounds, singly or in series.

Habitat

Coasts and estuaries, breeding on flat sandy islands. Non-breeders frequent sea coasts and... read more

Food and feeding

This species specializes on crabs (Neohelice granulata, Cyrtograpsus, Uca) but it also takes a wider range of... read more

Breeding

Nesting occurs from September, with large chicks present in November. Nests in colonies of 5–3000+ pairs, in subcolonies c. 50 m... read more

Movements

Post-breeding dispersal takes birds south to Tierra del Fuego and north to Uruguay. A few... read more

Status and conservation

Not globally threatened. Formerly considered Vulnerable and currently Near Threatened. The total known breeding population numbered under 1200 pairs in 1975–1977, and... read more

Recommended citation

Burger, J., Gochfeld, M., Christie, D.A., Kirwan, G.M. & Garcia, E.F.J. (2017). Olrog's Gull (Larus atlanticus). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/53964 on 19 August 2017).