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Species Encyclopedia: Black Swan

Time:2022-10-04 11:01:59 source:ucutxmastrees.com author:Rare species Read:685次
Species Encyclopedia: Black Swan

Black swan, Anseriformes Anseriformes Anatidae subfamily Swan genus, a total of 2 subspecies differentiation: named subspecies, New Zealand subspecies. Native to Australia, it is a unique species in the swan family. It has a typical swan appearance and is a world-famous ornamental rare bird. Compared to their size, they have the longest necks of any swan species. This slender neck is usually arched or erect in an "S" shape. Distributed in the eastern and southern regions of Australia, and later introduced to Singapore, the United Kingdom and some Western European countries. There are related breeding in China and Japan. The body length is 110-140 cm, the wingspan is 160-200 cm, and the weight is 3.7-8.7 kg. Like many birds, males are slightly larger than females and are sexually dimorphic. The plumage is curled, the body feathers are flickering, mainly black-gray or dark-brown, the abdomen is gray-white, and the flight feathers are white. The tail is long and forked, the outer feathers are blunt and upturned like a harp. Has a bright waxy bill, red or orange-red, with a white stripe near the end. The iris is red or white, and the tarsus and webs are black. Juveniles are gray-brown, with light feather thickness and lighter color. During the breeding season, it likes to live in open, food-rich shallow waters, and it likes birch forest belts and unforested plateau lakes and ponds most. In winter, it mainly inhabits large grassy lakes, ponds, rivers and beaches. Activity in pairs or groups, with strong nomadic nature, irregular migration patterns, mainly depending on climatic conditions, will form thousands of large groups when migrating. Feeds mainly at dusk, feeding on a variety of aquatic plants and algae, and occasionally insects. Mostly fly at night and call as they fly, but most activities take place during the day. Black swans have great flight abilities and can be seen in a line or a "V" when flying together for long distances. In flight and on the water, there are various loud tones. There are also occasional series of soft bass notes. The breeding season is from September to May of the following year, and they are monogamous and usually stay together for life. Nests in the sheltered places near the water, generally both males and females jointly nest. Each clutch lays 4-8 eggs, and the males and females take turns to hatch, but the females are the main ones. They are territorial and will flap their wings and chirp loudly when faced with a threat.

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