Why do birds build nests without a roof?

The world is so big, it's impossible to know all its secrets at once. Every living organism in nature has its own survival instinct. It knows how to seek benefit and avoid harm, and knows how to ensure its own safety. But there are some curious phenomena that are difficult to understand at a glance.

Turns out the birds are a lot smarter than we think. We often see some bird's nests in our daily life, and these bird's nests are usually located on a branch of a tree. They are built of fine grass or branches, and most of the small mouths are facing up, so why isn't the mother bird afraid it's gonna rain?

First thing to know is that the bird feathers are waterproof .

They are building a nest not only to live, but also to raise the next generation, so when it rains, the adult bird hides in the nest and covers the chicks with its body. Thus, the chicks are protected and the bird does not get wet.

In addition, most birds build their nests in lush foliage, so that large leaves help them block rain drops, so when it rains lightly, they will not be caught in the leaves. If it really rains heavily, the wings of the mother bird protect her babies from wind and rain.

And the reason why the bird's nest opens upwards is because it gives adults a wider field of view.

The nest provides comfort for feeding the chicks and allows the cubs to breathe the most fresh air.

As you can see, nature does nothing for nothing, everything is thought out down to the smallest detail. And what at first glance seems dysfunctional can have a certain function. And that's why nature's mysteries are so interesting.