 The taxonomic position is still debated, with some taxonomists treating Przewalski's horse as a species, "E. przewalskii", others as a subspecies of wild horse ("E. ferus przewalskii") or a feral variety of the domesticated horse ("E. f. caballus").It is named after the Russian geographer and explorer Nikołaj Przewalski.Most wild horses today, such as the American mustang or the Australian brumby, are actually feral horses descended from domesticated animals that escaped and adapted to life in the wild.