Zoo Med has just launched its Excavator clay substrate in a 20 lb version. This substrate allows reptiles to dig tunnels and burrows just like they do in nature. Reptiles can make their own caves for hiding, sleeping or hibernating. The customer can also change the look and feel of the reptile terrarium by moulding and creating multi-level terraces and burrows. Excavator is very good for all desert and temperate climate reptiles and is an all-natural product with no added dyes, colours, or chemicals. It will hold its shape so that burrows and tunnels don't collapse, says Zoo Med. Excavator is also available in a 5 lb and 10 lb bag.www.zoomed.com