Earthworms have well-developed tactile organs, including epidermal sensilla, taste sensilla and light sensilla. These auxiliary organs help earthworms perceive the outside world. Earthworms have lived underground for a long time, and their heads have completely degenerated, so they have no eyes. Instead, they use tactile organs to replace their eyes. Earthworms are very sensitive to the intensity of light and instinctively avoid strong light, which is one of the reasons why they live in the soil for a long time.

Earthworms' eyes are located in the photosensitive organs on both sides of their heads. These photosensitive organs can sense the existence and direction of light, but they can't produce images like those in the eyes of humans and other animals. Earthworms mainly rely on their own nervous system to perceive the surrounding environment, and also help earthworms perceive information such as food, danger and partners.

Habits of earthworms

Earthworms need a relatively humid environment to survive and reproduce. If they are in a dry environment, their bodies will become dry and fragile and difficult to survive. Earthworms feed on humus, dead plants, animal carcasses and other organic substances. By digesting these substances, they can decompose organic matter into smaller particles, thus promoting soil ventilation and water infiltration.

Earthworms have soft and elastic bodies, and they can easily pass through the soil. They contract their bodies with strong muscles, and at the same time secrete mucus to lubricate their body surfaces, so that they can move forward smoothly. Earthworms are hermaphroditic creatures, and each individual has reproductive organs. Their reproductive cycle is relatively short, usually ranging from a few days to weeks.