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.
YELLOW
Orange
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.
Green!
brown
blue
The tail is brown, fuzzy, and depending on the species color, sometimes it is red.