Equidae
Equidae (sometimes known as the horse family) is the taxonomic family of horses and related animals, including the extant horses, donkeys, and zebras, and many other species known only from fossils. All extant species are in the genus "Equus". Equidae belongs to the order Perissodactyla, which includes the extant tapirs and rhinoceros, and several extinct families.
List of mammals of Montana
Order: Chiroptera
Family: VespertilionidaeThe wild horse (Equus ferus) is a species of the genus "Equus", which includes as subspecies both the domesticated horse as well as the undomesticated Tarpan and Przewalski's Horse. The term "wild horse" is also used colloquially to refer to free roaming herds of feral horses such as the Mustang in the United States, the Brumby in Australia, and many others. These feral horses are untamed members of the domestic horse subspecies ("Equus ferus caballus"), and should not be confused with the two truly "wild" horse subspecies.