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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


[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.
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
  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.
  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 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.

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