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Animal Detail ViewՄանրամասն` նրանց մասին

28.02.2012

Swan Goose (Anser cygnoides)


Scientific classification

Kingdom: Animalia

Phylum: Chordata

Class: Aves

Superorder: Galloanseres

Order: Anseriformes

Family: Anatidae

Subfamily: Anserinae

Tribe: Anserini

Genus: Anser

Species: A. cygnoides

 

Description

The Swan Goose is large and long-necked for its genus, wild birds being 81–94 cm long (the longest Anser goose) and weighing 2.8–3.5 kg or more (the second-heaviest Anser, after the Greylag Goose A. anser). The sexes are similar, although the male is larger, with a proportionally longer bill and neck; in fact the largest females are barely as large as the smallest males. Typical measurements of the wing are 45–46 cm in males, 37.5–44 cm in females; the bill is about 8.7–9.8 cm long in males and 7.5–8.5 cm in females. The tarsus of males measures around 8.1 cm. The wingspan of adult geese is 160–185 cm. The upperparts are greyish-brown, with thin light fringes to the larger feathers and a maroon hindneck and cap (reaching just below the eye). The remiges are blackish, as are the entire underwing and the white-tipped rectrices, while the upper-and under tail coverts are white. A thin white stripe surrounds the bill base.

Range and Habits

The Swan Goose (Anser cygnoides) is a rare large goose with a natural breeding range in inland Mongolia, northernmost China, and southeastern Russia. It is migratory and winters mainly in central and eastern China. Vagrant birds are encountered in Japan and Korea (where it used to winter in numbers when it was more common), and more rarely in Kazakhstan, Laos, coastal Siberia, Taiwan, Thailand and Uzbekistan. Found always near water in mountainous regions.

Behavior

These geese are meant to be the most suitable 'watchdog ' being the chattiest breed with a curiosity unrivaled by other breeds. They can occasionally take a violent dislike to people. They are strong, active birds - geese imperfectly domesticated.

Diet

Swan Geese are often seen grazing on plains and stubble fields on plants, such as sedges (Cyperaceae).

Ducks and geese generally feed on larvae and pupae usually found under rocks, aquatic animals, plant material, seeds, small fish, snails and crabs.

Reproduction

In April, the Swan Geese return from their wintering ranges, for the breeding season with nesting activities usually occurring in May. Their nesting habitats are the taiga and mountain valleys near freshwater. Single pairs or loose groups are found near marshes and other wetlands. The average clutch consists of 5 - 6 eggs, but sometimes as many as 8 are laid. The shallow nest, made from plants, is placed directly on the ground. The eggs are incubated for about 28 days to hatching. Swan Geese leave their nesting territories around late August or early September for their wintering ranges. The young reach reproductive maturity when they are about 2 - 3 years old.

Conservation Status

The species Listed in the IUCN Red List and evaluated as Vulnerable.

 



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