Ants are very small, so how do they know if it will rain?

Because ants live underground, they are very sensitive to the change of air pressure before rain, because water vapor is rich before rain, and the density of soil is less than air. When the air contains more water vapor, the air density will change. It becomes smaller, and the atmospheric pressure also drops. And the air pressure in rainy days is smaller than that in sunny days. If it is found that the sudden drop of air pressure on a sunny day indicates rain, ants will go home in droves.

After the rain, ants usually start to move, because ants like to live in a suitable dry and wet environment. If it is a short rainy day, they will also raise the hole, and the position of their activities and the height of their nests are often just close to the rainy position. It is more accurate to observe the big black ants; Ants can predict the humidity of the air. If they knew there would be heavy rain, they would move ahead and move to a safer place. Ants migrate from lowlands to highlands to avoid being flooded by rain.

Ants usually communicate through antennae. They have a highly sensitive sense of smell. They look for food and find their way through tentacles. Their hearing is keen, and they can also help ants receive external information and avoid danger. Their motor function also depends on antennae. If there is no antenna, it will be difficult to walk even on the flat ground. You also need an antenna to explore the road and distinguish the food left by different ants on the ground. You can also judge whether food is poisonous or not.

In fact, many animals can tell the difference. It's going to rain. If you are near a pond, you know that there are often fish in this pond, then if you see that fish often surface at this time, it means that it is going to rain, because when it rains, the oxygen in the water will gradually decrease, and the fish will float to the surface to breathe the air.