Red-crowned cranes migrate between breeding grounds and wintering grounds every year. Only in Hokkaido, Japan, keeping birds for the local area and not migrating may be related to the organized feeding of local people in winter and sufficient food sources.

The habitat of red-crowned crane is swamp and swamp meadow, and its food is mainly shallow water fish and shrimp, mollusks and some plant roots, which changes with the seasons. The red-crowned crane molts twice a year, Stephane in spring and winter in autumn. This is complete molting, and it will temporarily lose its flight ability. Red-crowned cranes sing loudly, as a signal to define territory, and it is also an important way of communication during estrus.

Red-crowned crane is a kind of unisexual bird, and no special circumstances can last for a lifetime. The annual breeding period begins in March, lasts for 6 months and ends in September. They nest in shallow water or wet land with water, and the nesting materials are mostly grasses such as reeds. The red-crowned crane lays a nest of eggs every year, usually 2-4. Hatching is carried out by male and female birds in turn, and the incubation period is 3 1~32 days. A bird is an early bird.

Extended data:

Appearance characteristics of red-crowned crane;

1. The red-crowned crane has a body length of about 160 cm, a wingspan of 240 cm and a weight of about 10 kg. The whole body is almost pure white, and the top of the head is bare and hairless, vermilion. The forehead and eyes are slightly Kuroha, the ear feathers behind the eyes are white to the pillow, and the cheeks, throat and neck are black; The second and third flight feathers are black, and the third flight feather is long and curved into an arch, covering the tail.

Therefore, when standing, the tail is black, but it is actually a three-level flight feather, while the tail, primary flight feather and whole body feather are all white, which is very obvious when flying. The mouth is very long, light green and gray, and the neck and legs are also very long. The long and curved flight feathers between wings are black, and the whole flight feathers cover the tail when standing, which often makes people mistakenly think that it has black tail feathers. Both men and women are similar.

2, the iris is brown, the mouth is gray-green, and the tip is yellow. The exposed parts of tibia, tarsometatarsal and toes are gray-black, and the claws are gray. The chicks are covered with tawny down feathers, with light back, deep abdomen, milky white shoulders and red mouth and legs. After 3 ~ 4 months, the body feathers gradually turned white, and the exposed part of the top of the head did not appear red until 10 months later.

3. The skeleton of red-crowned crane is hard outside and hollow inside, and its strength is 7 times that of human bone. Moreover, when it migrates, it often forms a clever wedge shape, so that the individuals behind can use the airflow generated when the individuals in front flap their wings in turn to fly quickly, laboriously and persistently. The speed can reach about 40 kilometers per hour, the flying height can exceed 5400 meters, and you can sing while flying.

References:

Baidu encyclopedia-red-crowned crane