Mares are adult female horses, typically over the age of three. They are known for their nurturing behavior, especially when they give birth to foals. Mares can be found in various breeds, each with unique characteristics and abilities, such as Thoroughbreds for racing or Arabians for endurance. Mares usually have a strong bond with their offspring and are often protective. They can be bred for various purposes, including riding, work, and competition. The reproductive cycle of a mare is called the estrous cycle, which influences breeding times and overall health.