Why is the bird's nest built in the sky? Aren't they afraid of wind and rain?

The main reasons why the Bird's Nest was built in the sky are as follows:

First: The Bird's Nest is not a permanent residence for birds, but a temporary building for breeding.

In fact, birds nest mainly for breeding. Birds build nests only when they want to touch their genitals and provide shelter for their offspring. Moreover, when birds grow up, they will actually live alone. The family won't stay in this nest forever. This is just a temporary shelter for the birds. Since it won't live for a long time, the natural bird's nest is simpler, as long as it can bear a certain weight, don't let its eggs fall, and let the chicks live for a while.

In general, when the chicks grow up, this nest will actually be abandoned, because the chicks will be forced to go out and break into the world by themselves, and their parents will leave here, so the use time of this nest is still very short. Birds don't stay in a nest all their lives. In fact, there are many vacant abandoned nests in the wild.

Second: Birds' feathers are waterproof.

In fact, birds don't set ceilings in the sky because their feathers are waterproof, so even if it rains, they are not afraid of water. Birds' feathers are actually oily, which makes them not afraid of getting wet in rainy days, and birds' feathers can keep warm. So birds are not afraid in ordinary rainy days, except for heavy rain, but after all, such bad weather is rare, so birds will not bother to build roofs for their nests. When it rains heavily, birds will also fly under buildings or eaves to shelter from the rain and will not stay in the rain.

Third: A bird's nest without a roof is convenient for going out for food.

Bird's nests are usually made of simple branches. If the top is sealed, the exit will be smaller and there will be scattered branches, making it inconvenient for birds to go out for food. Moreover, when young birds are born, in fact, adult birds need to go out often to catch bugs and come back to feed young birds. It would be more convenient without a roof.