Here's why:
* Genetics: Blue eyes in horses are a result of a recessive gene. This means a horse needs to inherit two copies of the gene, one from each parent, to have blue eyes.
* Coat Color Association: Blue eyes are often associated with certain coat colors, like white or cremello, where the lack of melanin pigment can also affect eye color. However, they can also occur in other colors, but less frequently.
* Rarity: While not unheard of, blue eyes are a relatively rare trait in horses.
It's important to note: Sometimes, horses can appear to have blue eyes due to the way light reflects off their eyes, but this is not true blue eye color.