Contrary to popular belief, however, cats cannot see in total darkness. Each of a cat's claws is attached to a bone in the toe. When a cat points its toe, the claw is extended. Young cats purr when nursing to tell the mother that they are content. Older kittens purr when they try to get adult cats to play.
Cats show expression with their ears.
If a cat's ears are pointed forward they convey friendly interest and attentiveness. Ears pricked up and turned slightly backward are a warning that attack is imminent. Ears bent back and drawn down sideways show fear and readiness to take flight.