Cats used to be wild. Originally they were; they were hunters. Having a pliant body, quick reflex, sharp claws and teeth, cats were suitable for hunting preys such as rats. Not only they have suitable body characteristics, cats could capture high frequency that human being can’t. Sounds like cats are qualified as great hunters.
Despite cat’s hunting ability, cats are very social. Us, human beings, took an advantage of it and made cats as pets. Cats have to hide their wild side to us, however, when there’s an artificial rat, cats reveal their true face. They cannot stop playing or ‘hunting’ it. Cats want to hunt its artificial prey because they still have wild blood running in their bodies.
Maybe, someday, cats might reveal their hunter face to you