Yes, I have indeed wondered this for some time. Every morning my cat Misty would greet me with a loud "Meow ruck!" What does that mean? I really wonder. Only one per day though, FWIW. Yeah, Misty was such a sweet-natured cat, always. She died tragically in 2003. But did you know, she lived longer than any other cat I think. Here's a picture of her. I can never download pictures here. Anyone want to do it for me? Thank you so much if you do.