The Crested Pochard is a migratory bird. Every year in late March and early April, it migrates from its wintering grounds in the south to North China and southern Northeast China, and arrives at Changbai Mountain in the eastern part of Northeast China and Heilongjiang Province in the northern part of Northeast China in mid-April. In autumn, it begins to migrate southward in late September and early October; it arrives at its wintering grounds in the south from late October to early November. It often migrates in large groups.
It likes to live in groups. It often moves in groups, especially during migration and wintering, when it often forms large groups of hundreds of birds. It is good at swimming and diving, and can dive 2-3 meters underwater. When swimming, its tail hangs down to the water surface. They often float in groups in the rippling lake, and rarely move in shallow water near the shore or on the turbid water surface. When taking off, they flap their wings rapidly against the water, and run a distance on the water before they can fly, which makes them clumsy and inflexible, but after they fly, they fly very fast and powerfully.
Calls: There are often few calls in winter. When flying, it makes a hoarse, low-pitched kur-r-r, kur-r-r call.
Crested Pochard mates in late winter or early spring, with no set rules. Some birds form pairs before migrating, while others seek mates only after arriving at the breeding grounds. In all cases, they mate in noisy tufted migratory groups, most of which reach sexual maturity in the first winter, but most females do not participate in reproduction until the second year of age. Pair bonding usually begins in late winter and continues until the spring of the second year on the migration route. Some populations also form pairs after arriving at the breeding grounds. Nests are built in the grass or bushes by the lake or on the island in the middle of the lake, usually not far from the water. The nest is well hidden. Usually a natural pit is used or a pit is dug, and then padded with dead grass stems and grass leaves, with a lot of down feathers inside. The breeding period is from May to July. Each nest lays 6-13 eggs, usually 8-10 eggs. The eggs are gray-green or dirty olive in color, with a size of 53-66×38-77 mm, an average of 59×71 mm, and a weight of 52-61 grams, an average of 56 grams. The female bird incubates the eggs. The incubation period is 23-25 days. The chicks are female. After hatching, the chicks can follow the parents and forage. After more than 40-50 days of the chick period, they can fly.