Check out Zoo Med's Excavator Clay Burrowing Substrate! A clay substrate
that can be formed to your liking, while still allowing reptiles to dig
tunnels and burrows just like they do in nature. Watch your reptiles perform
natural digging behaviors; mold and create multi-level terraces and burrows in
your reptile's terrarium. Excavator holds its shape so burrows and tunnels
won't collapse. All Natural! No added dyes, colors, or chemicals.