Horses communicate with each other in the wild through a combination of vocalizations, body language, and physical contact. They use sounds such as neighs, whinnies, and snorts to convey messages to one another. Additionally, horses use their body posture, movements, and facial expressions to express emotions, establish hierarchy within the herd, and communicate warnings or signals. Physical contact, such as grooming, nuzzling, and leaning against each other, also plays a role in their communication dynamics.