What is the main characteristic of a Bay horse's body color?

The main characteristic of a Bay horse's body color is that it ranges from tan to reddish brown. This variety in shades is what defines the bay coloring, which typically features a reddish-brown coat with a black mane, tail, and lower legs. The hue can vary significantly, allowing for a broad spectrum that can appeal to different aesthetic preferences.

Other choices incorrectly describe the characteristics of bay horses; for instance, a pure black coat is not representative of the bay color, and the exclusively golden or yellow description pertains to the palomino coloration, while the brown to brown-black option does not capture the essence of the bay's distinct reddish undertones. Understanding the specific qualities that define the bay horse helps to appreciate the diversity within horse breeds and their colorations.