Mine is a bought one with two tiers I think if I was going to build one it would definitely have two levels because you are doubling the floor space and they love room. Unless of course your lucky enough to have room for small shed of some sorts for them.
The more space that you can give your ferrets, the better. Just imagine yourself being kept in a small office for a couple of weeks and then being expected to run around for a few hours in the fields. You'd be fit for nothing.
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