Black swan (scientific name: Cygnus atratus): it is a large swimming bird of Cygnus with a body length of1140 cm; Span 160-200 cm; Weighing 3.7-8.75 kg. Its neck is the longest among swans. A slender neck is usually arched or upright in an "S" shape. The whole body feathers are curly, and the spots on the body feathers are flashing, mainly dark gray or dark brown, with gray abdomen and white flying feathers.
Originated in Australia, it is an important member of the swan family and a world-famous ornamental rare bird. Black swans inhabit coastal areas, bays, lakes and other waters and move in pairs or groups. Their food is almost entirely plants, all kinds of aquatic plants and algae. Strong nomadism and irregular migration patterns mainly depend on climatic conditions, and thousands of large groups will be formed in the process of migration.