It really depends on what kind of rtb you are getting. Bcc's get larger than bci's I wouldn't recommend anything smaller than 6'x2'x2' for an adult bcc male and would go bigger for a female if you can. Bci's tend to be smaller especially males. You could probably get away with a 4'x2'x2' for a male but really with boas I like to think bigger is better. They seem to enjoy roaming and will climb if given the chance.
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