What are the phenomena in nature that indicate rain?

The phenomena that indicate rain in nature include swallows flying low, frogs chirping, ants moving, fish swimming on the water and earthworms coming out of holes.

1, swallows fly low

When it's going to rain, it's sultry, and some small flying insects fly very low in the sky, with small water droplets on their wings. Swallows fly very low in order to prey on these small flying insects. In addition, when it is about to rain, the airflow in the air is turbulent, and swallows always fly up and down. So, when people see swallows flying low, they know it's going to rain.

2. The chirping frog

Frog's skin and organs are very sensitive to weather changes. Before every storm comes, they will gather together and cry loudly. Especially before the thunderstorm weather comes in summer, frogs gather more and more, and their calls become louder and denser.

3, ants move

Ants, which nest underground, are very sensitive to the change of air humidity because of long-term life degradation. Ants digging holes in the ground know that when it rains, they will be flooded. When the air humidity increases before rain, ants will feel dangerous in lower places and move to higher places.

4. Fish swim on the water.

When it's going to rain, the clouds in the sky are thick and the air pressure is low, and people will feel a little depressed. Fish usually breathe oxygen dissolved in water. When the air pressure is low, the oxygen dissolves less, and the fish will feel bored and swim to the surface to breathe.

5. Earthworms come out of the hole

Before it rains, the ground is wet and soft, and earthworms will crawl out of the ground, which is also a sign of rain.