I have found that if given the chance mine will utilize climbing branches. Most of my adult cages/racks are not set up that way but in the one that is I do seem them hanging out on the dowel rods provided. I will sometimes swap the BRB's through that particular encloser so that they can get the additional excercize. I rarely see them use it during the day but if I sneak down there at night it's not unusual to find whichever boa I have in the cage hanging out or cruising off the ground.

Here's a really blurry pic of a male on them(taken at night through glass) but you can get the idea.

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