mermaids tail are any colours
Mudkip's tail has a light blue color in the normal form. As a shiny, its tail is changed to a light yellow/gold color.
The underdog's tail is white.
The color for any tail light on a vehicle is red.
Aqua Bayer's tail is gold.
Ariel's tail is green in color.
Orange
YELLOW
The tail of a red-tail catfish typically changes color as the fish matures, usually around 1-3 years of age. It starts off with a dark black color and gradually becomes more red as they grow older. The intensity of the red coloration can vary depending on the individual fish and their environment.
brown
Green!
blue
A beaver's tail is the same color as the rest of his coat. It is generally a brown of some shade. There are times when a beaver's tail can appear to be darker, but that's because it is usually wet.