In the wild, snakes don't really move GREAT distances. When they aren't hungry or thirsty, they spend they're time hiding somewhere. Once they are hungry or thirsty, they go and find it and go straight back to the hiding place. What I'm trying to say is that a baby snake in a large enclosure could feel really stressed out. The small cage serves as that "hiding spot". However, the food and water is already provided. This is the best I could explain it. Any experts can correct me if I'm wrong
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