The best enrichment is getting them out and letting them explore, supervised of course. This helps build muscle mass and keeps your animal tameAs for enrichment within the enclosure personally I like doing naturalistic enclosures when possible. Boas will climb if you provide climbing material such as logs/branches. The blood isn’t going to climb at all. Although I could see creating tunnels using cork slabs and switch them up occasionally. I’ve seen people do this with skinks as a way to double floor space. If your blood is full grown you’d need a large enclosure and pretty big cork pieces to build your tunnels/maze.
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