“…The American photographer Charles Lindsay, through his close friendship to the Mentawai shaman Aman Lau Lau on the island of Siberut (100 km west of Sumatra), was able to observe and photograph the peritoneal divination with chickens in 1985. 'One of the non-shamans breaks the chicken's neck and disembowels it so that the kerei can perform a divination' [9] . The missionary physician Johannes Winkler described various cock oracles of the Toba-Batak on the island of Sumatra, Indonesia.…”