The stuff I'm using goes by a couple of names: Bed-A-Beast and Eco-earth. It's actually coconut shavings. Been using it for years in all of my cages including cages for arboreals. It holds water well if you want a high humidity environment or it can be used dry. It won't grow mold and is harmless if ingested (no impaction). It hides odors and gives a naturalistic look to the cage.

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