Re: Birch bedding? Teabag bedding?
Teabag is unfortunately a strict no. It's just not safe due to the type of paper used since it can and basically always will contain plastic bits which are of course not safe if ingested.
As for birch, the wood itself would be safe but personally I wouldn't want to use any sort of wood for an entire cage. A high quality paper substrate will hold tunnels very well while wood isn't necessarily going to be as good for that.
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