The Mad Cat® Narwhal With Silvervine Stick will take cats on a fantasy adventure! Cats will be leaping, kicking, and pouncing for joy as they chase this Narwgal entertains a cat! Filled with a custom blend of tempting catnip and silvervine for twice the cat attractants, plus a fun crinkle for enticing sound. Silvervine is an all-natural catnip alternative that cats love, it elicits a similar reaction to catnip and works for many cats who normally are not affected by catnip.