Odd behavior question... If a cat is meeting a new kitty and they kind of take a small sniff and sit a watch them. Whats does it mean/why.. They lick there lips then kind of open and close there mouth real fast, kind of as it they are smacking there lips or something..? They do that many times while observing the cat. The cat is stiff and nervously watching, and is fine unless the other cat comes to them, then its automatic gorwling hissing ready to attack. Im just wondering about the mouth thing... its strange to me, anyone know a reason or what it means?