When spring comes, swallows will fly back to the north from the south.

I often look up at home and see some swallows.

Overhead, leisurely singing.

Call. That's because my grandmother planted a pomegranate tree.

There is a swallow's nest on that pomegranate tree.

The shape of the swallow is very special. Its back is black, like

Wearing a black cloak, its belly is white; tail

Pakistan is like a pair of black scissors; It flies around the tree.

Flying around like a trimmer, giving it to a big tree.

The leaves have been trimmed!

It used to fly high in the sky, but now.

Why are you flying so low? I find that whenever the weather is sultry,

Swallows fly very low, and it will rain heavily soon. I think

Curious, why does it rain when swallows fly low?

And then what? I seem to have heard grandpa say that swallows fly low and snakes fly low.

Tao, the proverb that heavy rain is coming.

So I found from popular science books that the air before rain

The indoor humidity is high, which makes the wings of insects wet.

Therefore, those insects that serve as food for swallows are greatly influenced by their flight.

Ring, can only fly close to the ground, so, Yan

The child also lowered the flying height and stuck to the ground.

Find your own food. When it is going to rain, it is empty.

The airflow in the air is turbulent. Swallows are shrouded in air currents.

Ring, always up and down, up and down. place

When the swallows fly low, it will rain.

I found the reason why swallows are raining in popular science books.

Don't fly low, but look for a lot! For example, it's going to rain

Why did ants move when they were young? Through this discovery,

I've learned: If we can observe carefully in life.

If you observe things around you, you will find many mysteries.

But it's amazing