I am working on making a pen for my quail. It is 4X6. I plan for them to be on the ground to make it like their natural habitat since they are purely for pleasure. I want to plant some plants or shrub that they can hide in. What would be good to plant? I'm also planning to put in a hollow log for them to hide in, and maybe a little box of sand to scratch in. Is there anything else that they would like? Any suggestions would be greatly appreciated.