Why are earthworms everywhere after the rain?

Earthworms live in the surface layer of soil and breathe by absorbing oxygen from soil pores through gas diffusion on the surface. When rainwater penetrates into the surface of soil, the oxygen content in soil pores is greatly reduced, and there is not enough oxygen, which will force earthworms to climb to the ground.

Earthworms are a common terrestrial annelids, which live in the soil, come out at night, feed on decaying organic matter and swallow it with the soil. It also eats fragments such as stems and leaves of plants. Earthworms can loosen soil, improve soil, improve fertility and promote agricultural production. There are more than 2,500 species of earthworms in the world, and there are 229 recorded species in China. There are many species of Pheretima, and there are more than 2,000 species in China.

Common earthworm species in extended data

Earthworms, Eisenia foetida, and Earthworms with different lips, the male reproductive pore opens in front of the 15 ring; 17 earthworm with male reproductive pore; Giant earthworm, ring-hairy earthworm, Eisenia foetida, Mauritius earthworm, Wuxi earthworm, lobular earthworm, etc.

Vermilion Wuxi is a famous luminous earthworm in China. This earthworm shrinks into a ball in the soil, the size of a grain of rice, and there is a fluorescent secretion in the earthworm. When stimulated, such as under certain temperature and humidity conditions, or when turning over the soil, this substance will be secreted, and after contacting with air, a certain light spot will be formed around the soil.

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