Rat vocalizations range in sound and intensity with peeps, hisses, squeaks, chirrups and shrieks being the most common descriptive terms. The sounds they make can indicate antagonist intent, pain, tension or relaxation.
The pitch and frequency of rat vocalizations are a way to determine the intent behind the noise. The sound that is called a “Peep” features an elevated pitch, starting from a high tone and moving upward. One sound a rats make is the “Brux,” which sometimes continues for many minutes. When a rat is bruxing, it is often a sign of relaxation but can also indicate loneliness or uncertainty.