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Brown skua
At Godthul, South Georgia
Scientific classification Edit this 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

S. a. antarcticus – (Lesson, 1831)
S. a. hamiltoni – (Hagen, 1952)
S. a. lonnbergi – (Mathews, 1912)

Synonyms

Catharacta antarctica

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.

Description

Brown skua eyeing a king penguin carcass

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

There are three accepted subspecies:[8]

  • S. antarcticus lonnbergi. Range: subantarctic.
  • S. antarcticus antarcticus. Range: Falkland Islands.
  • S. antarctis hamiltoni. Range: Tristan da Cunha.

Ecology

Diet

It feeds on fish (often via kleptoparasitism), penguin chicks and other seabirds, small mammals, eggs and carrion.[2]

References

  1. ^ 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.
  2. ^ a b "Stercorarius antarcticus lonnbergi — Brown Skua (Lonnberg's), Southern Great Skua". Species Profile and Threats Database Australian Government.
  3. ^ HBW 3 - Species accounts: Brown Skua Archived 2012-02-05 at the Wayback Machine (2011).
  4. ^ CRC Handbook of Avian Body Masses by John B. Dunning Jr. (Editor). CRC Press (1992), ISBN 978-0-8493-4258-5.
  5. ^ CRC Handbook of Avian Body Masses, 2nd Edition by John B. Dunning Jr. (Editor). CRC Press (2008), ISBN 978-1-4200-6444-5.
  6. ^ 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.
  7. ^ 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.
  8. ^ 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

  • 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.
source: https://en.wikipedia.org/wiki/Brown_skua