While a CAT TREE, a cat scratching post, and a CAT LITTER BOX serve different purposes, they complement each other to create a balanced indoor environment. A CAT TREE encourages exercise, climbing, and mental stimulation. A cat scratching post satisfies instinctual clawing behaviors and protects your furniture. A CAT LITTER BOX provides a private, hygienic elimination space. http://myrainbowpetsz.wikidot.com/myrainbowpets