Although some superstitious traditions associate cats with evil, cats are simply normal animals that are neither good nor evil. Some cultures even believe that cats bring good fortune.
Many of the evil or mean behaviors people attribute to cats are ways that they try to communicate with people. In some ancient cultures, cats were worshiped as benevolent gods. Even black cats, which are associated with bad luck in the United States, are seen as good omens in other parts of the world. Their nocturnal behavior and ability to hide may be why other cultures associated them with evil and witchcraft. This superstition became especially prevalent during the Middle Ages.