The terms Fox, Yellow, White, Willow, and Ash Grey are a mere formality and do not imply that only these five Immortal Families exist, nor does it mean there's no hierarchy among them.
Among them, "White" and "Grey" refers to the hedgehog and the mouse, which are rarely seen in the market. The main reason being their timidity and reluctance to shoulder responsibilities.
But this also depends on the specifics of the situation. For instance, in Tianmen City, whether it's the old canal transport docks in the past or the oceanic trade nowadays, the boatmen and sailors like to worship the mouse.
Firstly for wealth, secondly for safety.
In the past, the Tianmen Transport Gang maintained such a Black-Fur Ancestor.
