2. This video is about a video host who tied a knot with an earthworm, and as a result, the earthworm would untie the knot by itself. Very magical operation! This earthworm is knotted! The so-called "earthworm knot" means that the earthworm is in a dormant state. The dormancy of earthworm is related to soil temperature and soil moisture, and also related to its species. Even if the soil is very dry and cold, some of them don't hibernate.