I love emerald tree boas, but their size (according to my sources) requires an adult cage size of unmanageable width. I am looking for an arboreal species which does not need, yea which can be happy in a smaller enclosure of about 28 inches high 18 deep, and not more than 20 wide. I know this is a boa section, but any arboreal species will do - just point me toward something I can research further. Boas and pythons are my top picks, but I also like the look of vine snakes (which I will go read about right now).