Yes, cats do have bones in their tails. These bones are called caudal vertebrae. Most cats have between 18 and 23 of these small bones in their tails, which are an extension of their spine. The vertebrae at the base of the tail are larger and gradually become smaller toward the tip, allowing for great flexibility and mobility. The bones in the tail are connected by muscles (rather than just ligaments), which gives the tail a wide range of motion and the ability to move expressively for balance and communication.