A "dun" is a term used to describe a specific coat color in horses. It is characterized by a sandy or yellowish-brown body with a darker mane and tail. Duns often have a distinct dorsal stripe running down their back, and they may also display zebra-like stripes on their legs. This color is commonly seen in various horse breeds, including Mustangs and Quarter Horses. The dun coat color is a result of a specific genetic variant known as the dun gene. This gene affects the pigmentation of the horse's coat, leading to the unique coloration. Duns can vary in shade, ranging from light cream to deep gold, making them visually striking animals.