A Bull-Roarer is a noise maker. When put into the motion of rapidly swinging around and around,
the "Bull-Roarer" makes what can be described as a moaning sound. Said to have been used in ceremonies.
An actual Bull-Roarer was discovered in a cave south of Phoenix, Arizona. The Bull-Roarer was made out of a large mammal sternum that was wrapped in a piece of deer hide, and then secured with sinew. A stick was then attached with a piece of sinew to one end of the exposed bone. (Barnett,1973:35)
The following photo is from the bottom of a Hohokam Rincon Red-on-Brown helmet bowl from the
Tucson Basin, it depicts a human figure possibly using a "Bull-Roarer"