A horse with dark red or brownish-red body color and a dark mane and tail is referred to as?

A horse exhibiting a dark red or brownish-red body color, accompanied by a dark mane and tail, is identified as a bay. This color pattern is characterized by a reddish-brown body with variations in shade, where the darker mane and tail contrast sharply with the body color.

The distinction in this case is important because while chestnut horses also have red-colored coats, they generally have manes and tails that are the same shade as their body, lacking the darker hues associated with a bay. Thus, bay refers specifically to the combination of the darker mane and tail, which aligns perfectly with the description provided in the question.

This understanding of horse color terminology is essential for accurately identifying and classifying different breeds and individuals in equestrian contexts.