Horn is a medium-sized swimming bird, with a body length of 30~40 cm and a weight of 250~500 kg. It has a short black mouth, like a sharp chisel, which is very suitable for pecking shrimp. Short and round wings, short tail. The position of the two legs is long at the tail. There is a separate net like a petal on the toe, and a protrusion like a grid on the tip of the middle toe.

Horn breeds in Tianshan valley in northwest Xinjiang, overwinters in the lower reaches of the Yangtze River and the southeast coast, and they migrate through northeast and north China. Breeding overseas in Europe, Asia and northern North America; Wintering in southern Europe, East Asia and southern North America. Mainly inhabit lakes, rivers, ponds, reservoirs and swamps on the open plains.

Each diving time is 20~30 seconds, and you can stay underwater for about 50 seconds at most. They are also good at flying and have the strongest flying ability of all species. When taking off on water, run near the water for a while before taking off. When flying, the wings swing violently, mostly in a straight line, and the speed is also very fast.

In contrast, it is a complete "stupid duck" on land. Because its legs are so backward that it can hardly walk. Their main food is all kinds of fish, frogs, tadpoles and so on. They also eat aquatic insects, crustaceans, molluscs, and other aquatic cones without thorns, and occasionally some aquatic plants.

Horns generally nest in sheds, and aquatic plants such as reeds or aquatic plants thrive in sheds, while others nest scattered or in groups on the banks of hidden streams. Their nests are relatively large and float on the water like boats. They are called floating nests. Nests are made of aquatic plants. It's tight and strong.