Chimpanzees are very social animals and communicate with one another in a variety of ways. One of their most noticable forms of communication are their vocalizations. Chimpanees produce a variety of calls, with over 15 identified call types. Their vocal repertoire is graded, which means that it is often difficult to identify clear boundaries between many call types. Some of their calls are loud and function in long-distance communication between different parties of chimpanzees. Others are soft and function in close-range communication between party members. While much has been learned about chimpanzee communication in recent years, we still have much to discover. Below are descriptions, recordings and spectrograms of many of their call types.