What kind of immortal is a mouse?

The mouse is the grey fairy among the five immortals, ranking eighth among the eight immortals of animals, so it is also called the "eight grey lords". The folk worship of the mouse is because it lives in the dark and unpredictable at night, so it is considered to be highly intelligent and deified. Others think that mice can predict the future, predict divination and make people rich, and regard them as the god of wealth. There is a theme of "mice marry women" in folk paper-cutting.