LoL Yeah I like that Chattering sound they make! My rats usually only do it when I'm playing with them or in the middle of getting their little ears rubbed haha. Anyways, most of the time you can tell between the good squeaks (wrestling around) and the bad squeaks (beating each other up). The Bad Squeaks are more of a shriek then anything elseâ€¦it actually sounds like it hurts! I have two boys and most of the time I hear Just-Playing squeaks or soft little short ones caused by grooming a bit too hard, but once or twice Iâ€™ve heard a bad one.
The teeth grinding. I think it's called, "bruxing." I have been told that it's kind of similar to when cats purr.
Chirp. This is a high, clear sound, that is generally used conversationally, or else muttered under the breath. It sounds nothing like squeaking, and can indicate anything from "surprise" to "thinking." Gregor has said to me, "CHIRP!" like, "How do you like that?!?" When he gets busy grooming me, and gets around my ears, I hear him muttering, "chirpity chirpity chirp chirp chirp."
Squeak. The squeak is almost always "bad," at least from Gregor. I hear squeaks when the time comes for a bath. The translation is, "Don't put me in that water!" The squeak can also be conversational, however. Gregor was headed for my seashell collection (again,) and I gave him a command that he knows: "Gregor, come here!" He turned around, looked me right in the eye, and squeaked once. ("No!") After I stopped laughing, I picked him up, and told him that ~I~ tell ~him~ "no," and not the other way around.
I wondered the same thing, so I had Gregor's vet listen to his upper respitory functions through the stethescope, and she said his breathing was "clear" and he was just "making ratly noises." If you are concerned, though, I'd have the vet check them.