Well, it’s not like they’re so active, as I’m sure you’ve noticed. But they do like to stretch out from time to time when they’re in a situation where they feel safe. The photo below shows a 7 foot female I hatched in 1993 occupying half of a 72” x 36” x 18”H Vision cage. I have no doubt that if you built a taller cage with shelves and proper heating that a blood would happily utilize the different levels. But this is one species that does just fine in a low cage. I like 48” x 24” floor area for large males, and 54” x 36” for large females and pairs. Another nice thing about lots of floor space is that you have plenty of room for spacious hides and water containers. Sometimes I leave part of the cage floor bare and flood a section with water; the ridges in the bottom of the Vision cages allow a tiny pool of water to collect. Animals which never seem to get it together to raise their heads up and over to drink out of their water containers, immediately put their heads down and start drinking when the cage is sprayed. I have to be more scrupulous with sanitation if I do this, but one or two of my blood pythons seem to maintain better hydration this way.
-Joan