In Africa's only fetish market - at least that's what we were told - there are dozens of stalls with dead animals and talismans prepared by voodoo priests. These are called fetishes.
Each animal is used for a different application, i.e. a different disease. What and how much of the animal is needed and in which procedure it is ingested, administered, or sacrificed, is learned in conversation with a priest.
The fetishes also have specific and different spheres of action. In a ceremonial act with the voodoo priest, they receive their energy and their connection new owner.