What do fox, yellow, white and willow ash often refer to?

Fox Fairy (fox), Huang Xian (weasel), White Fairy (hedgehog), Liu Fairy (snake) and Grey Fairy (mouse), commonly known as "fox yellow, white and willow grey" (or "grey yellow fox") are five immortals.

"Fox, yellow, white and willow ash" originated from the shaman custom of ethnic minorities in Northeast China: the population of Shanhaiguan was opened to make a living in the late Qing Dynasty, and some people became ill after going to Kanto because of acclimatization. Some people combined the local shaman customs in Kanto, improved the treatment methods, and even appeared the Ma Xian in the form of shaman customs, which combined Buddhism and shamanism. Later, the belief in fox, yellow, white, willow and grey became popular in northern China.

Extended data:

In China's 5,000-year-old culture, there are not only heavy history and mysterious myths, but also a lot of folklore. Now the vast majority of folklore has become a feudal idea, which has been abandoned by people, including the "five immortals" who were once almost household names and well known to women and children.

In ancient times when feudal thoughts were everywhere, people were full of awe of everything in the world, so many folk "gods" were derived, and the five immortals were among them.

Although they are honored as "family immortals", they are actually just five kinds of ordinary animals. They have become "immortals" for various reasons, but they are also divided into good and evil, so everyone is in awe, for fear that an carelessness will annoy them and bring disaster.

Baidu Encyclopedia-Fox, Yellow, White, Willow, Grey, Chang