For example:
* Human appendages: Skin color varies greatly among individuals, so human appendages can be any shade of brown, white, black, or other colors.
* Insect appendages: Insects often have appendages that are brown, black, red, or green, depending on the species.
* Bird appendages: Bird legs and feet can be yellow, orange, red, black, or gray.
* Fish appendages: Fish fins can be a variety of colors, including red, yellow, blue, and green.
Therefore, you can't generalize the color of appendages. You need to specify the animal and the specific appendage to determine its color.