Earthworms are the term used to describe a family that is part of the class of annelids and it is estimated to date that there are about six thousand species. As is characteristic of most annelids, earthworms make up their bodies by a large number of rings that are similar to each other. These animals are native to the European continent, however at present it is possible to locate it in America and Western Asia, they have a cylinder shape and have special importance for crops, this is due to the food and aeration that it produces within them. This has a reddish gray hue, it is generally very normal to find them in the gardens of the houses.

One of the characteristics that stand out of this species is that they have aquatic origin, in addition to that, their breathing is via the skin and they require moisture to survive. In addition to this, they also have an important length, having an average size of 30 cm long and in some tropical regions reaching up to 4 meters.

It is important to note that the earthworm is an organism that plays an important role within the ecosystem in which it is found: this is because they are the first biomass of the soil, they also allow the formation of the soil, it contributes in the cycles of the Carbon and nitrogen, help the activity of microbes, add substantial improvements to the chemical and physical properties of the soil and are an essential part of the basic diet of both birds and some mammals.

THE basic function of earthworms is to excavate galleries in the ground, and as they carry out this task, they consume soil particles and also digest the organic remains that are there. Sometimes when the climate is extremely humid, they tend to drag the leaves into the earth in order to be able to nourish themselves and with this they aerate and make the soil in question more fertile, this is because thanks to them the phosphorus and potassium from the ground rise when they remove their waste.