A male horse is called a stallion. Stallions are adult male horses that have not been castrated, allowing them to reproduce. They are often characterized by their muscular build, strength, and spirited temperament, making them popular in various equestrian disciplines, including racing, show jumping, and dressage. Stallions require careful handling and training, as their natural behaviors can be more assertive than those of geldings (castrated males) or mares (female horses). Responsible ownership and management, including socialization and training, are essential to ensure that stallions are well-adjusted and safe to work with alongside humans and other horses.