Time：2023-02-03 04:36:11 source：ucutxmastrees.com author：Botanical Garden Read：777次

Species Encyclopedia: Black-necked Swan

Black-necked swans belong to the genus Swan of the subfamily Anseriaceae, Anseriformes, with no subspecies differentiation. It is a kind of swan produced in South America, and its body shape is very similar to that of the whooper swan. They are also the world's favorite swans to swim with their young birds. Breeds in southern parts of South America and migrates north in winter to Paraguay and southern Brazil near the Tropic of Cancer. Likes to live in swamps, lakes and lagoons with aquatic plants such as banana grass, reeds, duckweed, etc. With a body length of 90-130 cm and a weight of 3.5-4.4 kg, it is the smallest swan in the world. Males and females have similar plumage, and females are smaller than males. The body feathers are white, but the head and neck are black, and there is a white eyebrow line around the eyes extending to the occiput. The red warts on the forehead are very bright and developed. The cheeks are red, the mouth is blue-gray, and the muzzle is gray-white. The tarsus and webs are pink. Juvenile feathers are brownish-gray, which changes to adult feather color after one year. Mainly in the water, the neck is bent and the head is lowered when swimming. When flying, the neck is straight forward, the feet are stretched back, and the wings are flapped slowly and powerfully. Feed on various aquatic plants, seagrass, algae and aquatic insects. Timid and highly vigilant, when frightened, it chirps and flutters from the water while flapping its wings. But in normal times, their calls are weak and sound like panting. Likes to live in groups, sometimes mixed with other birds. Like other swans, black-necked swans are strictly monogamous. They are very family-friendly, and they both raise their offspring together. When swimming, they often carry their young birds on their backs and follow themselves. Breeding starts in July every year, but if the food is very abundant, it also starts in March-April. Nests on reeds or on small islands, laying 4-8 eggs per nest. The hatched chicks are precocious, but their chicks grow more slowly than other swans.

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