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[[Category:Birds]][[Category:Thalassarche]] | [[Category:Birds]][[Category:Thalassarche]] | ||
Latest revision as of 21:18, 12 February 2017
Alternative name: Grey-headed Mollymawk
- Thalassarche chrysostoma
Identification
70–85 cm (27½-33½ in), Wingspan 215-220cm (84¾-86¾ in). Similar to other mollymawks and confusable with several other species.
Adult: mantle dark blue-grey, more blackish on back, upperwings blackish-brown, rump white, tail dark grey and underparts white. Head blue-grey, paler on forehead and crown with dark brow and white crescent under eye. Underwing white with dark tip and irregular dark margins broadest on leading edge. Iris brown, bill black with bright yellow upper and lower ridges and pinkish-red to orange tip.
Immature:
Juvenile has blackish-grey bill and darker grey head and underwing almost all grey.
Subadults have dark bill with yellow tip, head closer to adult and more white on underwing.
Antarctic Convergence Zone between the Falkland Islands and South Georgia, March 2009
Similar Species
Grey head, bill colour and underwing pattern distinguish adult from Black-browed Albatross D. melanophris, the most similar species. Juvenile has the darkest underwing of any southern Diomedea and separated from juvenile Black-browed by blackish bill and darker collar.
Distribution
Circumpolar in Southern Oceans. Breeds on Diego Ramirez off Cape Horn, on South Georgia and on Marion, Prince Edward, Crozet, Macquarie, Kerguelen and Campbell Islands. Prefers colder waters and disperses throughout the Southern Oceans mainly south of 35 degrees south but occurs north to 15 degrees south off Peru in the Humboldt Current. Uncommon but regular off eastern South Africa and in Australia occurs May to November off southern and western coasts and common off eastern Tasmania.
Vagrants reported from the North Atlantic but none are currently accepted and also reported from the Pacific coast of Panama.
Taxonomy
This is a monotypic species[1].
Diomedea vs. Thalassarche
Genera Phoebastria and Thalassarche formerly placed in the Diomedea, but now considered by virtually all authorities (Clements, Howard & Moore, AOU, BOU, SACC) to be separate genera in light of Nunn et al. (1996) and Penhallurick & Wink (2004).
Habitat
At breeding sites from August until May, otherwise at sea, rarely follows ships.
Behaviour
Vocalisation
Various braying, grunting and cackling calls.
Breeding
Nest is a large bowl made of mud and vegetable matter. One egg, white with pinkish-brown band at larger end (107 x 67mm). Incubated by both parents for about 55-60 days and young fed by both parents. Fledges after five months.
Diet
Their diet consists of squid and fish, sometimes refuse from ships.
References
- Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2015. The eBird/Clements checklist of birds of the world: v2015, with updates to August 2015. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
Recommended Citation
- BirdForum Opus contributors. (2024) Grey-headed Albatross. In: BirdForum, the forum for wild birds and birding. Retrieved 10 May 2024 from https://www.birdforum.net/opus/Grey-headed_Albatross
