Fortune Telling Collection - Ziwei fortune-telling - Many bird's nests on branches are open-air. What will they do if it rains?
Many bird's nests on branches are open-air. What will they do if it rains?
The location of the bird's nest is very learned.
Careful people can find that the position of birds when nesting is very regular:
First of all, they built the bird's nest on the branches, skillfully using the stability of the triangle to ensure that the bird's nest would not fall apart or fall down even if it was windy and rainy.
Secondly, the bird's nest is generally selected in a tree with dense leaves and built under the canopy, so that on the one hand, it can block the direct sunlight, on the other hand, it can make maximum use of the leaves above to block the rain, and generally moderate rainfall will be blocked by leaves.
Third, nests are generally built very high, because the higher the nest is built, the safer it is, which can prevent the sneak attack of small animals such as cats and mice and reduce the risk factor. The nest is mainly used for laying eggs and incubating birds. If the nest is built very low, the eggs in it will be eaten by small animals.
The structure of the bird's nest is very learned.
Let's take the bird's nest built in a tree as an example. They are usually made of some branches and firewood to ensure that the bottom of the bird's nest is not solid and there is a gap in the middle, so that even if it rains, it can fall down along the gap and there will be no rain gathering in the bird's nest.
Moreover, this kind of bird's nest with gaps can be dried as soon as the rain stops, ensuring the air permeability of bird's nest.
The feathers of adult birds can keep out the wind and rain.
Because birds can nest outdoors, they are not worried about rain at all.
It is true that if birds are still flying in rainy days, the rain will wet their feathers and cause gaps in their wings, which will not provide enough lift to continue flying. However, generally speaking, birds don't go out to fly in rainy days. They will hide in the bird's nest or under the eaves to avoid the rain.
There is a layer of oil on the feathers of birds, which can be waterproof and warm, and protect young birds from getting wet in rainy days.
Therefore, even if the rain drops through the leaves to the nest, adult birds will generally spread their wings to shelter their young birds from the wind and rain.
Why not "close" the bird's nest?
In fact, the bird's nest is built in the open air, which has several advantages besides the limited building capacity of birds.
First, if the bird's nest has no roof and a wide view, birds can find natural enemies in the distance for the first time. If the bird's nest has a roof, it is easy to block the view, and it is estimated that they will not know how to die.
Second, the bird's nest has no roof to facilitate vertical takeoff, and predators can take off at any time when attacking.
Third, the bird's nest has no roof to facilitate the feeding of adult birds. The feeding posture of birds is simple and rude. Adult birds stand above the nest, and young birds open their mouths upwards. If the bird's nest has a roof, it will be inconvenient.
To sum up, birds have considered the possibility of rain when building their nests, so they build their nests on leafy trees and rely on leaves to shelter them from the wind and rain.
Moreover, there are gaps in the bird's nest structure, which can ensure the rapid discharge of rainwater and avoid rainwater gathering.
In addition, the wings of adult birds are covered with grease to prevent rain from getting wet. When it rains heavily, adult birds will spread their wings to shelter young birds from the wind and rain.
Of course, smarter birds will choose to nest under the eaves of human beings, so that even if it rains heavily, it will not affect them.
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