Many animals can see the world clearly only by vision, so does earthworm have vision? In my memory, it seems that I have never seen the eyes of an earthworm.

We all know that earthworms are annelids with slender bodies. It can walk freely in wet and loose soil, but how does it observe the movement around it? So I dug up an earthworm from the ground to observe. Putting it on the ground, I saw the earthworm stretch forward with its body. I can't see its eyes with the naked eye. So, I observed it with a magnifying glass and didn't find its eyes. Huh? Do earthworms really have no eyes? I put a brick on the earthworm's way. When the earthworm's skin was about to touch the brick, it immediately turned to avoid it. I put the earthworm in different light intensity, and as a result, the earthworm climbed to the weak light. Earthworms have no eyes. Why can they avoid obstacles and distinguish the intensity of light? In order to find out this problem, I looked up a lot of information and finally found the answer in the book "100,000 Why": The book said: "The research of modern zoologists proves that the eyes of earthworms are gradually degraded because they live underground for a long time and can't see any light. The one protruding in front of its head is its mouth, called the anterior lobe of its mouth, which has no visual function and is only used for asking for food and digging holes. However, the front end of the earthworm has a very sensitive olfactory organ, which is used by the earthworm to identify the direction and explore the road. In addition to the ventral surface, other parts of the earthworm body are distributed with organs that feel light, which can distinguish the intensity of light. "

By studying earthworms, I also know that earthworms have no eyes or ears, but their bodies are very sensitive to vibration. If an earthworm loses a part of its body, it has the ability to regenerate this part, and new nodes will grow at both ends of its body.

Experiments show that earthworms do use tactile organs instead of eyes, and they are very sensitive to the intensity of light. When they encounter strong light, they will instinctively avoid it, which can make them fully adapt to soil life.