Wolf calls are a type of vocalization used by wolves to communicate with each other. The two most common wolf calls are yowls and HOWLS. Yowls are short, low-pitched vocalizations that are used to express distress or to call out to other wolves. HOWLS are longer, higher-pitched vocalizations that are used to announce the presence of a pack or to call out to other wolves. Both yowls and HOWLS are important for wolves to communicate with each other and to maintain their social structure.