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Shag (Phalacrocorax aristotelis)
Shag fact file
- Description
- Biology
- Range
- Habitat
- Status
- Threats
- Conservation
- Find out more
- Glossary
- References
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Shag description
| Kingdom | Animalia |
| Phylum | Chordata |
| Class | Aves |
| Order | Pelecaniformes |
| Family | Phalacrocoracidae |
| Genus | Phalacrocorax (6) |
The shag (Phalacrocorax aristotelis) is very similar in general appearance to the cormorant (Phalacrocorax carbo), but is smaller and slightly slimmer (1). In breeding condition, adults develop a green gloss to the black plumage, and a black crest develops on the head (1). Outside of the breeding season, the plumage is duller and the bill is more yellow in colour (1), although there is a yellow patch at its base throughout the year (3). Juveniles have dark brown upperparts and pale underparts with a white chin (1). A variety of grunting and clicking calls are produced (1). The common name originates from the Old Norse word 'skegg' meaning beard, and refers to the crest (3).
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Related species
Shag biology
Like the cormorant, the shag mainly feeds on fish, but it fishes in deeper water (3) and prefers different prey species (2). It dives for fish from the surface of the water with a pronounced leap (1).
The nest is located on offshore islands, rocky stacks and cliff ledges (8). It is made of twigs and rotting seaweed, and is said to have an extremely pungent smell that increases in intensity as the decomposition of the seaweed continues (3). After hatching, the chicks stay in the nest for eight weeks (5).
Shags tend not to travel great distances, adults usually remain within 100 kilometres of the breeding area, but juveniles move up to 200 kilometres (2). Occasionally a phenomenon known as a 'wreck' occurs, when adverse weather conditions drift birds inland, where they become stranded in unusual habitats. This results in very high mortality for immature birds (2).
TopShag range
The shag is generally a coastal bird, and occurs inland less often than the cormorant. It has a wide distribution around the coastline of Britain and over Europe (2).
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Species with a similar range
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You can view distribution information for this species at the National Biodiversity Network Gateway. |
See this species on Google Earth.
TopShag habitat
Shags breed in loose colonies (1) on rocky coastal cliffs and islands (2). Nests are made in crevices, under boulders or in small caves (1).
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Species found in a similar habitat
Shag status
The shag is classified as Least Concern (LC) on the IUCN Red List (1). Receives general protection under the Wildlife and Countryside Act 1981. Classified as a species of conservation concern by the UK Biodiversity Action Plan, although not a priority species (2). Included in the Birds of Conservation Concern Amber List (medium conservation concern) (7).
Shag threats
Shags are not threatened at present; however, manmade disasters such as oil spills are potentially extremely damaging, and can result in high local mortality (8).
TopShag conservation
There is no conservation action directly targeted at this species. However, many populations occur within protected reserves, and like all wild birds, the shag is protected by the Wildlife and Countryside Act (4).
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View information on this species at the UNEP World Conservation Monitoring Centre. |
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There may be further information about this species available via the National Biodiversity Network Gateway. |
Find out more
For more information on the shag and other bird species:
-
BirdLife International:
http://www.birdlife.org -
The RSPB:
http://www.rspb.org.uk
Authentication
Information authenticated by the RSPB:
http://www.rspb.org.uk/
References
-
IUCN Red List (February, 2011)
http://www.iucnredlist.org/ - Mullarney, K., Svensson, L., Zetterstrom, D., & Grant, P.J. (1999) Collins Bird Guide. HarperCollins Publishers Ltd, London.
- Lack, P. (1986) The Atlas of Wintering Birds in Britain and Ireland. T. & A. D. Poyser Ltd, Calton.
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RSPB (2003) The population status of birds in the UK
http://www.rspb.org.uk/Images/5_20625.pdf - Greenoak, F. (1979) All the birds of the air; the names, lore and literature of British birds. Book Club Associates, London.
- RSPB (2003) Pers. comm.
- Hume, R. & Pearson, B. (1993) Seabirds. Hamlyn Limited, London.
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Naturenet (July 2002):
http://www.naturenet.net/law/wcagen.html
More »Related species
This species is featured in:
This species is featured in the Mediterranean Basin eco-region
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Shag pair
© Bernard Castelein / naturepl.com
Nature Picture Library
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