i forget what the stuff is called, but most of it is finer than the big pieces in those pics (the bigger stuff is on top, and he happend to be where alot of the biggest pieces are. Also the surface there is rather dry, but as soon as you move it around a little its pretty damp under it (just a quarter inch or so down it starts lookin wet). Now that it has actually started to burrow instead of just lay under stuff i am probably going to mix some moss and stuff into the mix to help it hold its form better, and make it deeper.