On December 21, 1972, sixteen young survivors of Uruguayan Air Force Flight 571 were rescued after spending ten weeks stranded at the crash site of their plane, high in the remote Andes Mountains. The incident made international headlines and spawned several best-selling books, fueled partly by the fact that the young men had resorted to cannibalism to survive.

Matt Rossano examines this story from an evolutionary perspective, weaving together findings and ideas from anthropology, psychology, religion, and cognitive science. During their ordeal, these young men broke "civilized" taboos to...