Egyptian goose

Egyptian goose
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Anseriformes
Family: Anatidae
Subfamily: Tadorninae
Genus: Alopochen
Species: A. aegyptiacus
Binomial name
Alopochen aegyptiacus
(Linnaeus, 1766)
Native range of A. aegyptiacus

The Egyptian goose (Alopochen aegyptiacus) is a member of the duck, goose, and swan family Anatidae. It is native to Africa south of the Sahara and the Nile Valley.

Egyptian geese were considered sacred by the Ancient Egyptians, and appeared in much of their artwork. They have been raised for food and extensively bred in parts of Africa since they were domesticated by the ancient Egyptians. Because of their popularity chiefly as ornamental bird, escapes are common and small feral populations have become established in Western Europe.[2][3]

Taxonomy

The Egyptian goose is believed to be most closely related to the shelducks (genus Tadorna) and their relatives, and is placed with them in the subfamily Tadorninae. It is the only extant member of the genus Alopochen, which also contains closely related prehistoric and recently extinct species. mtDNA cytochrome b sequence data suggest that the relationships of Alopochen to Tadorna need further investigation.[4]

The generic name is based on Greek ἀλώπηξ (alopex'), "fox", and χήν (chen) "goose", referring to the ruddy colour of its back. The species name aegyptius is from the Latin Aegyptius, "Egyptian".[5]

Description

It swims well, and in flight looks heavy, more like a goose than a duck, hence the English name.[6] It is 63–73 cm (25–29 in) long.

The sexes of this species are identical in plumage but the males average slightly larger. There is a fair amount of variation in plumage tone, with some birds greyer and others browner, but this is not sex- or age-related. A large part of the wings of mature birds is white, but in repose the white is hidden by the wing coverts. When it is aroused, either in alarm or aggression, the white begins to show. In flight or when the wings are fully spread in aggression, the white is conspicuous.[7]

The voices and vocalisations of the sexes differ, the male having a hoarse, subdued duck-like quack which seldom sounds unless it is aroused. The male Egyptian goose attracts its mate with an elaborate, noisy courtship display that includes honking, neck stretching and feather displays.[8] The female has a far noisier raucous quack that frequently sounds in aggression and almost incessantly at the slightest disturbance when tending her young.[9]

Distribution

This species breeds widely in Africa except in deserts and dense forests, and is locally abundant. They are found mostly in the Nile Valley and south of the Sahara. While not breeding, it disperses somewhat, sometimes making longer migrations northwards into arid regions of the Sahel.[7] It has also been introduced elsewhere: Great Britain, the Netherlands, France, and Germany have self-sustaining populations which are mostly derived from escaped ornamental birds.[2] Escapes have also bred on occasion in other places, such as Florida and New Zealand.[2] The British population dates back to the 18th century, though only formally added to the British list in 1971.[10] In Britain, it is found mainly in East Anglia, in parkland with lakes.[11] It was officially declared a pest in the U.K. in 2009.[12]

Behaviour

This is a largely terrestrial species, which will also perch readily on trees and buildings. Egyptian geese typically eat seeds, leaves, grasses, and plant stems. Occasionally, they will eat locusts, worms, or other small animals.

Both sexes are aggressively territorial towards their own species when breeding and frequently pursue intruders into the air, attacking them in aerial "dogfights".[9] Neighbouring pairs may even kill another's offspring for their own offsprings' survival as well as for more resources.[13]

This species will nest in a large variety of situations, especially in holes in mature trees in parkland. The female builds the nest from reeds, leaves and grass, and both parents take turns incubating eggs.[8] Egyptian geese usually pair for life. Both the male and female care for the offspring until they are old enough to care for themselves.[13]

Gallery

References

  1. ↑ BirdLife International (2012). "Alopochen aegyptiaca". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. 1 2 3 Braun, D.G. (2004). "First documented nesting in the wild of Egyptian Geese in Florida" (PDF). Florida Field Naturalist 32 (4): 138–143.
  3. ↑ Dohner, Janet V. (2001). The Encyclopedia of Historic and Endangered Livestock and Poultry Breeds. Yale University Press. ISBN 030013813X.
  4. ↑ Sraml, M.; Christidis, L.; Easteal, S.; Horn, P.; Collet, C. (1996). "Molecular Relationships Within Australasian Waterfowl (Anseriformes)". Australian Journal of Zoology 44 (1): 47–58. doi:10.1071/ZO9960047.
  5. ↑ Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp. 33, 42. ISBN 978-1-4081-2501-4.
  6. ↑ "What characteristics distinguish Egyptian Geese?". Archived from the original on 16 June 2013.
  7. 1 2 Madge, Steve; Burn, Hilary (1988). Waterfowl: An Identification Guide to the Ducks, Geese, and Swans of the World. Boston: Houghton Mifflin. pp. 170–171. ISBN 0-395-46727-6.
  8. 1 2 "Egyptian Goose Fact Sheet". Lincoln Park Zoo. Archived from the original on 19 Jul 2011.
  9. 1 2 MacLean, Gordon L.; Roberts, Austin (1988). Roberts Birds of Southern Africa. Hyperion Books. ISBN 978-1-85368-037-3.
  10. ↑ Holloway, Simon (2010). The Historical Atlas of Breeding Birds in Britain and Ireland 1875-1900. A & C Black. ISBN 9781408128664.
  11. ↑ "Egyptian goose". RSPB. 13 December 2012. Retrieved 28 April 2013.
  12. ↑ McCarthy, Michael (30 September 2009). "Britain's naturalised parrot now officially a pest". The Independent (London). Retrieved 1 May 2010.
  13. 1 2 "Egyptian Goose". Honolulu Zoo. Archived from the original on 2 April 2012.

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