Rodger,
Does your cat 'chitter' when he or she sees the animals outside? I've known a couple of cats that seem to just get beside themselves when they see a critter outside and can't get to it. They make a chittering noise, almost like a squirrel. Not all of them seem to do it, my two don't, but one of my girlfriend's does.
Yes! Strangest darned sound. I think she (Sarah) is clicking her teath along with a gutteral sound.
Al