Well,
The amount of space you give depends on how many animals you want. I prefer to enjoy all of the animals in my care VS feeling like a farmer and having to use efficiency setups. I totally understand the need for them because having a lot of anything creates the need for faster cleanup, feeding, water changes plus time savings. Smaller more efficient caging setups also open up more space for more caging.
That said BCs ARE semi arboreal and they will use vertical space. They will also physically benefit from the climbing and exercise.
There are large BCCs found in their natural habitats high up in the canopy, not just the baby BCs.
I have a 48" x 30" x 20" Pro-Line and I think I would have gone 24" high if I was not concerned about heating.
This particular boa is about 5.5 feet long and is fed from perches 90% of the time, and he also will climb in the evenings.
I have these perches about 15-15.5" off the deck and he has 5" between the perch and the ceiling when he is up(bottom cage). The top cage here is 14" high and there is a young coastal carpet in it. She will soon get a 24" tall cage.
Another option is to cycle your animals through the taller cages every few cleaning/disinfecting sessions and then they can all get a crack at the bigger space but you don't have to outfit the whole room with big cages.
Personal preference really, but I like seeing them climb.
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