The common boa, sometimes called the “red tail” boa, is a medium to large snake from Central and South America, as well as parts of Mexico. It is often confused with the Columbian or true red tail boa, Boa constrictor, of which it was considered a subspecies until relatively recently. Despite their size, common boas can make an excellent choice of pet snake for novice keepers due to their generally docile nature, hardiness, and longevity.