My cats LOVE the Canadian catnip mice from Catmandu!! I find them all over the apartment. I try to circulate their toys (take some out, put others away for a while) so they don't get bored with them. My 12 year old cat Mollie Rose will come flying from the other end of the apartment whenever she hears me crumple up a piece of paper. She also loves balls of aluminum foil and paper bags as well.