Some swallows living in northern Europe, whenever a cold wave strikes in winter, will gather together in droves and enter a dormant state.

Agile adult birds will fly to the warm south; The newly hatched birds in the nest go into a dormant state, waiting for their parents to come back for food.

2. white-breasted crake

The crake chose a dry cave or mud cave and went into it to hibernate. Crake can't eat, move or move very little in the cave, so the number of breaths is reduced, blood circulation is slowed down, metabolism is weakened, the consumption of nutrients in the body is reduced as much as possible, and life is maintained by stored fat.

3. Nightingale

When winter comes when food is scarce, the nighthawk will find a shelter tree hole to hide and sleep. At this time, its body temperature will drop from 38 degrees to about 20 degrees to reduce the consumption of nutrients in the body.

Extended data:

Migratory birds migration:

Migratory birds (houniao) Some birds can migrate regularly with the change of seasons in 1 year to change their habitats. This kind of bird is called migratory bird. Migratory birds can be divided into summer migratory birds and winter migratory birds. The former refers to flying to a certain area to nest and have children in spring and summer. When the young birds grow up, it is already late autumn. They fly to warmer areas in the south for the winter, and then fly to this area to breed in the next spring. For this area, this kind of bird is called summer migratory bird.

Such as Rujiayan, which spreads all over China in summer and migrates to southern Yunnan, Hainan Island, Xisha Islands and Taiwan Province Province in winter; Another example is cuckoo and oriole, which belong to summer migratory birds. The latter refers to wintering in a certain area in winter and flying to the north to breed in the next spring. When the young birds grow up, it's late autumn and they fly to their original place to spend the winter. For this area, such birds are called winter migratory birds. For example, geese, swans and wild ducks are winter migratory birds in the middle and lower reaches of the Yangtze River in China.

Most migratory birds have the habit of migrating from north to south, flying from near to far, and the farthest can cross the ocean, such as peregrine falcon, which can fly directly from Siberia to Australia via China. In addition, there are few migratory birds that can fly from west to east or from east to west.

Baidu Encyclopedia-Hibernating Birds

Baidu Encyclopedia-Winter Migratory Birds