Time：2023-03-20 04:34:26 source：ucutxmastrees.com author：Zoo Read：164次

Species Encyclopedia: Black-billed Swan

Black-billed swans, also known as trumpeter swans and trumpet swans, belong to the genus of the Anseriformes Anatidae. Distributed in the United States and Canada, it likes to live in open, food-rich shallow waters during the breeding season, and mainly in grassy lakes, ponds, and rivers in winter. With a body length of 139-163 cm, an average wingspan of 210 cm, and a weight of 7-13.6 kg, it is the largest native bird in North America and the largest waterfowl in the world. Male and female feathers are the same color, and the female bird is slightly smaller than the male bird. The plumage is white, the base of the mouth is high and the front is gentle, and the eyes are exposed first. The mouth is black with a pink beak line along the base of the mouth. The neck is slender, exceeding or equal to the length of the body. When swimming in the water, the neck is vertically upward, the head is stretched forward, the wings are close to the sides, and the swimming is light and slow. The tarsus, webs, and claws are also black. Juveniles are gray-brown, with a darker head and neck, and lighter underparts, tail and flight feathers. Sex-loving clusters, except during the breeding season, they often live in groups; especially in winter, they often live in family groups; sometimes they live together in large groups of dozens to hundreds. When migrating, they often fly in small groups or family groups of 6-20 animals. When taking off, the two wings beat the water surface continuously, and the feet run a certain distance on the water surface to fly. When flying, the neck is stretched forward and the feet are extended under the tail. The flight altitude is high and the queue is neat, often in the shape of "one" and "V". It mainly feeds on leaves, stems and seeds of aquatic plants, and also eats a small amount of mollusks and aquatic insects. The breeding season is May-June, nesting on dry ground or dry reeds on the shores of lakes, ponds and small islands. The nests are extremely large and are built by the females alone. Each clutch lays 4-7 eggs, usually 4-5 eggs, and the spawning time is mostly from the beginning of May to the middle of May. The eggs are hatched by the females alone, and the males are on guard near the nest. The chicks are precocious and can follow their parents for food soon after hatching.

(责任编辑：Bird)

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