Depends. Some nights, my boas are just bonkers and climb all over the place. Other nights, they are are just slugs. I have never owned a burm but i will say so far, Caesar the retic is the most active of everyone. He is out and about at night 90% of the time. The boas like i said are sometimes going bonkers but usually it is more towards feeding day.
And Pat was really active when i got him but now he is kind of like a BP on a stick lol. He usually moves around to 3 different spots.....his cool spot in the back behind a plant, the front perch right out front or directly under his CHE. Then when it gets close to dinner, i sometimes catch him cruising around a little.
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What boa are you getting?