The leech (Bipalium) is also called "the snake of heaven" and "indigenous method" in ancient times. Lentinus edodes, Hirudoidae. It is 20-30 cm long and its head is fan-shaped. Yellow, with five black longitudinal stripes on it, lives in wet soil beside roots or at the foot of walls. Leech is a relatively low-level terrestrial flat animal, belonging to leech family. Commonly known as the indigenous method, the ground worm. Its head is fan-shaped, its body is flat and not segmented, and it is symmetrical left and right. Generally, the body length is 20 ~ 30 cm, and the length can reach more than 60 cm.
Leeches are distributed in moist soil near roots or walls. The Latin name of the hirudo of the family Platycladidae is Bipalium kewense, which belongs to the genus Hirudo and was called "snake" and "indigenous method" in ancient times.