Leeneia, you're so right! Our cat has, as I said earlier, a number of different vocalisations, ranging from the chirrup which is a happy greeting (and can also indicate a change of activity) to various vowel-based sounds. She also answers questions (her responses come at exactly the right time, even if we haven't decoded them properly yet), comes to her name and frequently acts as if she's totally understood what we were saying. She's worked out that when I've got my shoes on then I'm off out, and tries to waylay me to prevent me going, and gets huffy if an overnight bag is packed.
It's exactly a year since she came into our lives now and we're so pleased to find that she's an intelligent and sensitive member of the family.