Territorial by Nature
In BlogCats need their own space and objects to claim as their own. Cats are territorial and are creatures of habit. By providing them with a cat tree, scratcher or cat shelf, you are providing positive outlet for their natural behavior. Scratching and rubbing on certain objects is their way of saying “Hey, this is mine!” Each time a cat rubs their head or face on your leg or other objects they are leaving behind their scent from glands near their mouth, ears temples etc. The same applies to scratching. This is one reason why cats will typically return to the same spot (the corner of your couch) to scratch again and again.