Why are all the little monsters in Japanese anime worms?

There are representative types of monsters in every country.

However, Japan belongs to a humid area, and there should be more insects. Moreover, the traditional way of ghosts and gods in ancient Japan occupies a major position, including giving birth to women and treating patients. Therefore, my teachers in Enigmatic, that is, Yin and Yang, also act as doctors and have close ties with religion, so the medical conditions are generally backward. Perhaps the general insect and snake bites are not easy to treat.

The above is totally unfounded, and I just speculate =