Some of the dwarf localities stay fairly small, like the pearl island or the ones bioteacher recommended. I don't really agree that common BCI stay under 5 feet. My male is only a year and a half old and is already pushing 4 1/2 feet. They usually get on average between 6-8 feet, give or take. I like the looks of Hogg Island boas but I think they are on the larger side of "dwarf" species.