It really varies. Females will get bigger than males, but true red tails (BCCs) get bigger than common boas (BCIs). I think most BCI females fed moderately get to be about 5-7ft. I think average lenght for a female BCC is 8-12ft, but I could be wrong. I did all of my research on BCIs before I bought mine.
Boas can easily get over weight too so if you ever see a round boa they are over weight.
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