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South Polar Skua

From Opus

Stercorarius maccormicki
DisplayingPhoto by steinnTroll Station, DML, Antarctic Peninsula, November 2008
Displaying
Photo by steinn
Troll Station, DML, Antarctic Peninsula, November 2008

Contents

[edit] Identification

53 cm
There are Light, Intermediate and Dark Phase morphs

  • Grey-brown upperparts
  • White or straw-brown head and underparts

[edit] Distribution

Antarctic.

Purported to be the most southern of all birds. Reported as far south as the South Pole. Migrate northwards during the southern winter after breeding, spending most time at sea - visitor to Australia, probably on passage. Sighted as far north as Greenland & the Aleutian Islands.

[edit] Taxonomy

This is a monotypic species[1].

Has been placed in the genus Catharacta with the other large skuas (Sibley & Monroe, 1993; Clements, 2000).

[edit] Habitat

Coasts.

[edit] Behaviour

[edit] Breeding

The nests are shallow depressions on the ground may be on rocky outcrops, cliffs or valley floors. The clutch consists of 2 mottled eggs which are usually laid in November and December. They are incubated for 24 to 34 days.

[edit] Diet

The diet includes fish, krill, squid, carrion, crustaceans, molluscs and the eggs and chicks of seabirds. They will follow ships and forage on any jetsam. At sea will chase and harass smaller birds, forcing them to drop their prey or regurgitate, known as kleptoparasitism. Known as the "Raptor of the South".

Fiercely predatory. Highly territorial and will defend their territories vigorously against all intruders. Will fly straight at head.

[edit] References

  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, B.L. Sullivan, C. L. Wood, and D. Roberson. 2012. The eBird/Clements Checklist of Birds of the World. 6th ed., with updates to October 2012. Ithaca: Cornell Univ. Press. ISBN 978-0801445019. Spreadsheet available at http://www.birds.cornell.edu/clementschecklist/downloadable-clements-checklist
  2. AvianWeb
  • The Slater Field Guide to Australian Birds
  • Arctic Connection.Com - Wildlife of Antarctica
  • Australian Government - Australian Antarctic Division
  • List of references

[edit] External Links

Australian Antarctic Division - http://www.aad.gov.au/default.asp?casid=1643
Wildlife of Antarctica - http://www.antarcticconnection.com/antarctic/wildlife/birds/skuas.shtml

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