Shrunken head heads of monkeys or sloths. Some even used goatskin. Kate Duncan wrote in 2001 that "It has been estimated that about 80 percent of the tsantsas in private and museum hands are fraudulent," including almost all that are female or which include an entire torso rather than just a head. Thor Heyerdahl recounts in "Kon-Tiki" (1947) the various problems of getting into the Jívaro (Shuar) area in Ecuador to get balsa wood for his expedition raft. Local people would not guide his team into the jungle for fear of being killed and having their heads shrunk. In 1951 and 1952
Herman Watzinger which was cancelled because of World War II, and applied for a job in the U.S and sought a visa to the U.S. He met Thor Heyerdahl in New York City, where he was asked to participate in the construction of the Kon-Tiki raft and become a member of the expedition. On board the raft, where he was second in command, he was responsible for meteorological and hydrographic measurements. After the Kon-Tiki expedition, he returned to Lima in 1970, where he worked as head of fisheries, projects and advisor in freezing techniques for WR Grace & Co and Atlas. Watzinger