The brown skua (Stercorarius antarcticus), also known as the Antarctic skua, subantarctic skua, southern great skua, southern skua, or hākoakoa (Māori), is a large seabird that breeds in the subantarctic and Antarctic zones and moves further north when not breeding. Its taxonomy is highly complex and a matter of dispute, with some splitting it into two or three species: Falkland skua (S. antarcticus), Tristan skua (S. hamiltoni), and subantarctic skua (S. lönnbergi). To further confuse, it hybridizes with both the south polar and Chilean skuas, and the entire group has been considered to be a subspecies of the great skua, a species otherwise restricted to the Northern Hemisphere.
| Brown skua | |
|---|---|
| |
| At Godthul, South Georgia | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Charadriiformes |
| Family: | Stercorariidae |
| Genus: | Stercorarius |
| Species: | S. antarcticus
|
| Binomial name | |
| Stercorarius antarcticus (Lesson, 1831)
| |
| Subspecies | |
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S. a. antarcticus – (Lesson, 1831) | |
| |
| Synonyms | |
|
Catharacta antarctica | |
Description
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This is the heaviest species of skua and rivals the largest gulls, the great black-backed gull and glaucous gull, as the heaviest species in the shorebird order although not as large in length or wingspan.[2] It is 52–64 cm (20–25 in) in length, 126–160 cm (50–63 in) in wingspan and has a body mass of 1.2–2.18 kg (2.6–4.8 lb).[3][4] S. a. hamiltoni measured on Gough Island, weighed an average of 1.43 kg (3.2 lb) in 9 males and 1.65 kg (3.6 lb) in 9 females. S. a. lonnbergi measured in the Chatham Islands weighed an average of 1.73 kg (3.8 lb) in 30 males and an average of 1.93 kg (4.3 lb) in 32 females. The latter is one of the highest colony mean body mass for any living species of shorebird.[5]
A study in 2016 reported that brown skuas can identify individual human beings, possibly indicating high cognitive abilities.[6]
Brown skuas have been noted for sometimes bonding with humans who live for extended periods in Antarctica, such as the Eastern Orthodox clergymen at Trinity Church, and engaging in playful or apparently mischievous behavior with them.[7]
Taxonomy
editThere are three accepted subspecies:[8]
- S. antarcticus lonnbergi. Range: subantarctic.
- S. antarcticus antarcticus. Range: Falkland Islands.
- S. antarctis hamiltoni. Range: Tristan da Cunha.
Ecology
editDiet
editIt feeds on fish (often via kleptoparasitism), penguin chicks and other seabirds, small mammals, eggs and carrion.[2]
References
edit- ^ BirdLife International (2017). "Catharacta antarctica". IUCN Red List of Threatened Species. 2017: e.T62289571A111158661. doi:10.2305/IUCN.UK.2017-1.RLTS.T62289571A111158661.en. Retrieved 20 February 2022.
- ^ a b "Stercorarius antarcticus lonnbergi — Brown Skua (Lonnberg's), Southern Great Skua". Species Profile and Threats Database Australian Government.
- ^ HBW 3 - Species accounts: Brown Skua Archived 2012-02-05 at the Wayback Machine (2011).
- ^ CRC Handbook of Avian Body Masses by John B. Dunning Jr. (Editor). CRC Press (1992), ISBN 978-0-8493-4258-5.
- ^ CRC Handbook of Avian Body Masses, 2nd Edition by John B. Dunning Jr. (Editor). CRC Press (2008), ISBN 978-1-4200-6444-5.
- ^ Lee, W.Y.; Han, Y.D.; Jablonski, P.G.; Jung, J.W. & Kim, J.H. (2016). "Antarctic skuas recognize individual humans". Animal Cognition. 19 (4): 1–5. doi:10.1007/s10071-016-0970-9. PMID 26939544. S2CID 254131457.
- ^ Mihailova, Natalya (March 6, 2015). "Russian priest feels closer to God in serenity of Antarctica". Pravmir. Archived from the original on November 30, 2020. Retrieved November 28, 2020.
- ^ Furness, Robert W.; Boesman, Peter F. D.; Garcia, Ernest (2020). "Brown Skua (Stercorarius antarcticus), version 1.0". Birds of the World. doi:10.2173/bow.brnsku3.01species_shared.bow.project_name. ISSN 2771-3105.
Further reading
edit- Harrison, Peter (1996). Seabirds - an identification guide. Christopher Helm: A & C Black, London. ISBN 0-7136-3510-X.
- Heather, Barrie D; Robertson, Hugh A & Onley, Derek (2000). The field guide to the birds of New Zealand. Viking: Printing Press. ISBN 0-670-89370-6.
External links
edit- Brown skua, subantarctic skua - Species text in The Atlas of Southern African Birds
