Hi, among these many animals which one is your favorite?> which one can be find everywhere? And it also s keep as a pet in some houses. The cats. You of course see one and you might know the sound of cats, the sound is like mew, miu, miue and something like this. The sound them make for expressing they feeling for example the purr for expressing their pleasure feeling and also for expressing anger. But low frequency making by purr of cats, base n a study of a scientists, help to the strength of bones of cats. So that it helps the cats health.