Hi Phil. It is important not to overcrowd the cage. Almost all Chucks have a "bathroom" in their cages. Ususally it is a corner where there is an uneven rock pile that they can climb on, drop the poop between the rocks, and drag their tails over the tops of the rocks for cleanliness. However, if there are more than two lizards in the cage, the system breaks down, and poop anarchy reigns! Toothbrush and warm water comes next! LOL