Cats have about 100 vocalizations, which they mix and match to talk to us because we can't read their exquisitely expressive body language. Cats’ vocabulary is just as rich and subtle as their body language. The cat's vocal apparatus differs from our own and is not designed with speech in mind. However cats need to communicate, both with other cats and with owners. They "speak" to each other through body language, communicating feelings and intentions through posture and facial expression. Scent is also an important component of cat communication. In addition, they have a vocabulary of sounds ranging from caterwauls to mewing sounds, from hisses to the "silent meow" which is probably a sound pitched too high for human ears to hear. The familiar "miaow" is used mainly for communicating with humans as we are evidently too thick to understand anything other than kitten-talk.