Although chipmunks are solitary, they have numerous vocalizations that reflect their state of mind.
A fairly common vocalization is chirping. In this case, inexperienced contemporaries sometimes get the idea of keeping birds and not squirrels, because Burunduks can chirp well and persistently. They express joy or surprise in this way. Squirrels also chirp during the mating season, this is how the female calls her male.
Loud whistling, on the other hand, means that the chipmunk is not quite comfortable with something. This happens in situations that are exciting and new to the animal. The whistling sound is very high and unpleasant for the human ear. Some squirrels also whistle when they want attention.
Another vocalization made by squirrels is cooing. This is what they hear when they are disturbed or frightened. As with whistling, some neglected animals try to draw attention to themselves in this way.
If a squirrel ventures into foreign territory, it can lead to nasty fights. These are then accompanied acoustically by a growl. Shortly before hibernation, when the squirrel becomes aggressive towards the owner, it also often growls, usually trying to bite at the same time.