Two wooden bull roarers, Western Australia, c 1870-1925.

One of these Aboriginal artifacts is perforated at both ends, the other at one end. They are decorated with a carved, rectilinear design. Both are from north west Wyndham, Western Australia. When attached to a cord and swung through the air, bull roarers emit a deep, vibrant, roaring sound. They are important in rituals in Australian Aboriginal society as well as in some South American cultures.