What do you mean by earthworms knotting?

Earthworm knotting refers to the belt of earthworm, which is a ring-shaped protrusion, as if the earthworm had been knotted.

The thicker part of the first half of the earthworm's body is called the belt. The slender body of earthworm is composed of 100 segments. The front part is a little sharp, the back end is a little round, and there is an inconspicuous ring at the front end.

The front end is about 13 knots away from the girdle, and the rear end is far away from the girdle, so the main basis for distinguishing the front end from the rear end of earthworm is the position of the girdle. Earthworms, also known as earthworms, are terrestrial invertebrates of Oligochaeta in annelids.

Earthworms are warm-blooded animals, and their dependence on external temperature is stronger than that of warm-blooded animals. The surface temperature of earthworm changes with the change of environmental temperature, which also affects the growth and absorption of earthworm itself. Prolonged exposure to unsuitable temperature will greatly reduce the reproductive capacity of earthworms.

Earthworms are nocturnal animals and usually go out from 8 pm to 4 am the next day in summer and autumn. Their feeding and mating are carried out in the dark. And I like to live in wet, loose and organic soil, especially fertile gardens, vegetable gardens, cultivated land, ditches, rivers, ponds, canals and sewers, garbage dumps and pools near canteens.