When do swallows nest?

Swallows start to build nests in March every year, and migrate from the middle of 65438+1October to the end of165438+1October every year according to the regional temperature.

Domestic swallows nest under the eaves of farmhouses. The nest is made of saliva bonded with soil and grass stalks, covered with soft weeds, feathers, rags and so on. And some Artemisia annua leaves. The bird's nest is dish-shaped.

Breeding 2 nests every year, mostly from May to early June and from mid-June to early July. Each nest lays 4 ~ 6 eggs. The second nest is less, 2 ~ 5 pieces. Eggs are milky white. Males and females hatch eggs together. 14- 15 days, chicks hatch and parents eat together. The chicks fly out in about 20 days, and then feed them for 5 ~ 6 days, so they can feed themselves. The food is full of insects.

Extended data

In winter, the food supply of swallows in temperate regions is greatly reduced, so many species migrate. But unlike most other passerine migratory birds, swallows migrate during the day and fly at low altitude.

In addition, they often feed during migration, so their fat reserves are lower than those of other migratory birds of the same size. Species that breed in Africa often migrate with rainfall patterns, but the specific situation is little known. Other species, such as the gray-waisted swallows, seem to wander around without a fixed migration route.

The distribution of many species of Myrsinaceae has expanded, because they increasingly use buildings as their nests, and these birds are constantly attracted to places they didn't know before.

For example, the red-fronted swallow spread southward to Kenya and Tanzania, while the cave cliff swallow entered the southern United States from Mexico. And the change of environment will also cause the change of distribution mode. Ru Yan and other British populations spend the winter in South Africa. Due to the increase in rainfall in the west, their range of activities has expanded westward.