ZOO MED EXCAVATOR CLAY BURROWING SUBSTRATE 9KG Excavator is an amazing forming clay that allows you to create elaborate desert setups, while still allowing your pet to form their own network of tunnels and burrows. It allows 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 reptiles terrarium Make your reptiles feel like they are "at home" in their natural habitat. Excavator holds its shape so burrows and tunnels wont collapse. All Natural! No added dyes, colors, or chemicals.