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Species Encyclopedia: Whooper Swan

Time:2022-10-04 07:01:31 source:ucutxmastrees.com author:Small size Read:252次
Species Encyclopedia: Whooper Swan

Whooper swans, also known as cough swans and yellow-billed swans, belong to the genus of Anseriformes, Anseriaceae, and have no subspecies differentiation. Mainly distributed in Asia and Europe. Their distribution area is very broad. If the climate is mild, their breeding area can expand to the north, and the breeding time can also be earlier. In years with low temperature, they are distributed in the Yangtze River Basin and nearby lakes in China in winter, and move to North China in spring. Breeding in Xinjiang, Northeast China, Mongolia and Siberia. Prefers to inhabit open, shallow waters with lush aquatic plants. It is a second-class protected animal in China. Tall, with a body length of 120-160 cm, a wingspan of 218-243 cm, and a weight of 8-12 kg. The male and female are the same color, and the female bird is smaller than the male bird. All feathers are white, only the head is slightly brown. The mouth is black, the base of the upper mouth is yellow, and the macula extends forward along the sides below the nostrils, forming a trumpet shape. The cygnets of the same genus also have similar characteristics, but the macular area of ​​cygnets is limited to the sides of the mouth base, and does not extend below the nostrils along the edge of the mouth. Juveniles are gray-brown throughout, with a darker head and neck, and lighter underparts, tail, and flight feathers; after a year they fully develop the same white feathers as adults. Sex-loving clusters, except during the breeding season, they often live in groups, especially in winter, they often live in family groups, and sometimes there are as many as dozens to hundreds of individuals living together in large groups. Timid, highly vigilant, stay away from the shore when moving and perching, swimming mostly in open water, and even inhabiting water far from the shore at night. Mainly forage in the morning and evening, feed on aquatic plant leaves, stems, roots and seeds, and also eat a small amount of mollusks, aquatic insects, aquatic invertebrates, etc. Their mouths have a strong ability to dig food and can dig up food buried 0.5 meters under the silt. Usually more on the water. Good swimming, generally not diving. When swimming, keep your neck straight and perpendicular to the surface of the water. Swim slowly and calmly, with graceful posture. Rarely take off unless absolutely necessary. Due to its large and cumbersome body, it is not very flexible to take off. It needs to flap its wings sharply on the water surface, and its feet run a certain distance on the water surface to fly. Sometimes it sings while flying and swam, the sound is monotonous and hoarse, like the sound of a trumpet. They are one of the highest flying birds in the world and can fly over the roof of the world - Mount Everest, reaching a height of more than 9000 meters. They leave the breeding grounds to migrate to the wintering grounds in late September each year, and arrive at the wintering grounds from late October to early November. At the end of February and the beginning of March of the following year, they leave the wintering grounds to migrate to the breeding grounds, and arrive at the breeding grounds at the end of March and early April. When migrating, they often fly in small groups or family groups of 6-20 animals. Migrations are mostly carried out along lakes, rivers and other water areas, with constant rest and foraging along the way. The breeding season is May-June, nesting on dry reeds on the shores of waters such as lakes, ponds and islets. Each clutch lays 4-7 eggs, and the hatching is borne by the females alone. The chicks are precocious and can follow their parents for food soon after hatching.

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