@Daniel RIchardson - You might find this thread worthwhile:My cat talks through the window to other cats, by making some very strange noises, i though it was a strange machine the first time I heard it!
Apparently grown cats only meow at humans and will use various other noises for communicating with other cats:
How do Cats Communicate With Each Other & With People? - Tuxedo Cat
Haha! That one made me laugh.I don't really think I want to know what Twinkie and Mellie say to each other. I suspect it would mostly consist of feline cursing.