The island species of boa like you have are known to climb rather frequently. All boa constrictors are semi arboreal and will display this behavior when provided housing that allows them to do so.
18" tall is probably a good place to start. I have my 6 foot male Colombian BC in a cage that is 48" x 30" x (20" tall).
The cage is from Constrictors NW (Pro-Line). It is a single drop door and the cage is HDPE plastic.
If these snakes are not overfed, they will become quite active at night and I catch my fella out climbing in the warmer months.
More often than not, he will feed from his perched area.
If you enjoy watching your snake eat, it is quite interesting to see them do it from the air.
This rabbit never touched the ground after he started eating.
If I could do it over, I'd have gone 24" tall, but 20 is ample for this snake, and because the cage is a big 30" deep the heating may have been a bit tougher but I really don't think 4 more inches of ceiling would be an issue for that.
This cage is for a 6+ foot carpet python. It is 48" x 24" x 24".
This would be a nice size for your snake if it is fully grown. Same brand just not as deep and 4" taller.
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