What is a feral horse versus a truly wild horse?

The distinction between a feral horse and a truly wild horse is a biological one that reflects whether the animal's species has ever been domesticated rather than whether the specific individual has ever had human contact. A truly wild animal belongs to a species that has never been domesticated through selective breeding and human management across generations — Przewalski's horse, native to the steppes of Central Asia, is the only horse subspecies that meets this definition, having evolved independently of human domestication. Mustangs and other free-roaming horses found in North America, Australia, New Zealand, and other parts of the world are technically feral — they are descendants of domesticated stock that escaped or were released and established self-sustaining populations living without human management. The practical significance of this distinction for training purposes is that feral horses retain the basic trainability of the domestic species from which they descended, because the behavioral plasticity and human-directability that make horses trainable were selected for over thousands of years of domestication and remain in the genetic inheritance of feral populations. This is why experienced trainers consistently report that mustangs, once they accept human contact, can be trained using the same methods that work with domestic horses — the trainability is in the genes even if the individual animal's experience is entirely wild. In everyday use, the terms wild and feral are often used interchangeably when referring to mustangs, and within the horse training community the term wild horse is understood to mean a horse living without human management regardless of the technical biological distinction between wild and feral species.