What are the natural phenomena before it rains?

A: Humans, animals and insects all have different phenomena:

Sky: the air humidity increases, the air pressure decreases, the sky is dark, the clouds are densely covered, and sometimes there is lightning and thunder.

1, ants can move-ants digging holes in the ground will be flooded when they feel it's going to rain, that is, they will run away before it rains. 2, flying insects fly low-(generally, before the arrival of rain, the air humidity will greatly increase, and the air pressure will be significantly reduced. The moisture in the air will condense on their wings, and the wings of insects will become heavier. Swallows will fly low to catch insects. 3, small fish will float to the surface to breathe-(low air pressure in water, less dissolved oxygen).

4. The chirping frog

5. Earthworms come out of the hole-the ground is wet and soft, and earthworms will climb out of the ground, indicating that it will rain.

6, rheumatism patients will have knee pain.

Second, what is the role of animal tails?

A: It turns out that the tail of the beast has its own wonderful function besides balancing the body!

1, cats and dogs often wag their tails gently to express their feelings for their owners or the same kind. The long tails of lions, tigers and leopards are one of their fighting weapons. When fighting with other animals, you can knock them down by wagging your tail.

The scorpion has a sharp and hooked thorn at the end of its tail. When hunting, it catches small animals with its feet and then poisons them with its tail thorns.