Sand particles and other course materials then help the worm to grind food, before passing it to the intestines. The thin, sensitive skin of the worm allows him to carefully monitor where he is at all times. Light, moisture, gravity, heat and vibrations are all understood by the worm, and help him to avoid possible danger. When the worm feels threatened, he leaves an area and continues to move forward until it finds a new and safe environment. Worms often leave their home territory and go in search of a safer environment when they sense overpopulation problems, inadequate food supplies, insects, predators, and molds and mildews.
Every worm also has two sperm receptacles.
Despite this, it takes two worms to reproduce. Worms reproduce by moving close together and positioning their heads so that they are pointing in opposite directions. The worms then secrete a type of mucus, which bonds them together. Sperm is then released and carried by the grooves of their skin. Once the sperm has been passed, the worms separate.