Slugs, commonly known as dragonflies, are transformed from snails and widely distributed in Europe, Asia, North America and North Africa. Lusheng Soft shell-shaped snail with irregular cylindrical shape. The shell degenerates into a calcareous thin plate, which is located at the back of the front end of the body and is wrapped by the outer cover film to form the inner shell. There is a caudal crest. The body is gray, tan or orange, with inconspicuous dark stripes and spots. Two pairs of antennae. The eyes are located at the top of the rear antenna. The male and female genital foramen is 1*** with the same hole, which is located on the right side of the body and behind the right front antenna. The opening of the pulmonary foramen is at the posterior edge of the mantle. The body often secretes mucus, which will leave silver marks after crawling. Living in a dark and humid place, lurking during the day and going out at night and rainy days. Androgyny, mating and spawning, eggs are laid in wet soil. Feeding on the tender leaves and buds of plants is the enemy of vegetables, fruit trees, tobacco and cotton. The common species in China is the yellow slug. Large, the body length can reach 120 mm when stretched. Yellow-brown or dark orange with yellowish spots. Live in a dark and humid place or in the shade of a house. It is most active in high humidity and high temperature seasons. Love to eat plants, is an agricultural pest.