But most cats don't respond to catnip. No one knows why black cats are considered to be bad luck in some cultures. And black cats eventually became associated with witches because women accused of practicing black magic tended to adopt alley cats as companions. In the English Midlands, new brides are given black cats to bless their marriage, and the Japanese believe that black cats are good luck—particularly for single women. Baby cats make the plaintive noises to get their mother’s attention, but as full-grown felines, they don't meow while interacting with other cats.