Avoid heat rocks. Under tank heating works well, unless the enclosure is too thick, but you can find how too's to work around that.

As far as smaller Boas, I would look at locality animals, Gus at www.riobravoreptiles.com is an excellent source of information and animals. Sex won't matter much in most instances, I'd look more at the individual animal then the gender.

Good luck.
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Randall L Turner Jr.
Boas make the world go round.

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