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Boas are a type of snake that are members of the Boidae family. Boas are basal snakes. True boas are medium sized to large snakes. Females are usually larger than their male counterparts. Boas contain many subspecies based on locality. They include Colombian, Suriname, Bolivian, Peruvian, Hog Island, Long Tail Peruvian, Argentine and more. The boas from the amazon basin are the most colorful possessing bright cherry red tails. It used to be said that boas were New World Snakes and pythons were Old World Snakes, but, with boas found on Madagascar, Fiji Islands, and the Solomon Islands, this is not quite true. Instead, it is possible that boas have survived in evolutionarily isolated areas.