Originally Posted by hisangelonly
oh okay so kind of like a side effect? Just happens in some horses?
Sort of. More like a vestigial coloring than anything else. Most animals are darker from above and lighter from below, or evolved from animals that were. The source of that pattern is from simple natural selection which favored sea creatures/animals being camoflaged by the sky when seen from below and land creatures/animals being camoflaged by the ground when seen from above...