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South Georgia Shag

From Opus

Alternate names: South Georgia Blue-eyed Shag, South Georgia Cormorant

Breeding plumagePhoto © by Colin MurrayGrytviken, South Georgia 18 November 2007
Breeding plumage
Photo © by Colin Murray
Grytviken, South Georgia 18 November 2007
Phalacrocorax georgianus

Contents

[edit] Identification

L 72 cm (28'), W 27cm (10.6")
Largish black and white, blue-eyed marine shag
Males are larger in most mensural data, particularly wing and tail lengths.
Breeding - Yellow knob (caruncle) over nostrils. Crest.
Nonbreeding - Lacks yellow knob. No crest.
Immature - Brown fringing on wing coverts. Pale forehead. White throat.

[edit] Similar Species

Smaller than the two closest living, similar species Imperial Shag and Antarctic Shag with a proportionally shorter bill. Has less white in the face than Antarctic Shag. Range does not overlap with either species.

[edit] Distribution

Restricted to South Georgia Islands, South Sandwich and South Orkney Islands.

[edit] Taxonomy

This is a monotypic species, which in the past has been included in Imperial Shag.[1]

[edit] Habitat

Non-breeding adult. Photo © by Joseph MorlanGrytviken, South Georgia 6 March 2018.
Non-breeding adult.
Photo © by Joseph Morlan
Grytviken, South Georgia 6 March 2018.

Breeds on Tussac grass slopes, building truncated cone shaped nests of dried kelp, grass and mud.

[edit] Behaviour

Lays 2-3 greyish or bluish eggs in Nov-Dec, incubated by both sexes for 28-31 days. Chicks continuosly brood for 12-15 days and leave the nest at two months and fledge at around 65 days.

[edit] References

Immature. Photo © by Joseph MorlanGold Harbour, South Georgia 8 March 2018.
Immature.
Photo © by Joseph Morlan
Gold Harbour, South Georgia 8 March 2018.
  1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2017. The eBird/Clements checklist of birds of the world: v2017, with updates to August 2017. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
  2. Alvaro Jaramillo. 2003. Birds of Chile. Princeton Field Guides. ISBN 0-691-11740-3
  3. Gómez Laich, A. (2012). Imperial Cormorant (Phalacrocorax atriceps), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/nb.impcor1.01
  4. Orta, J., Garcia, E.F.J., Christie, D.A., Jutglar, F. & Kirwan, G.M. (2018). South Georgia Shag (Phalacrocorax georgianus). 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 https://www.hbw.com/node/52651 on 6 June 2018).
  5. Shirihai, H. (2002) A Complete Guide to Antarctic Wildlife. The Birds and Marine Mammals of the Antarctic Continent and the Southern Ocean. Princeton University Press: Princeton & Oxford.

[edit] External Links

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