Shrunken-heads, and how they got that way
Website History of the Shuar gets right to business and explains all about ye olde shrunken head trade in the pre-Colombian Americas. Includes handy galleries of itsy bitsy shake n' baked craniums, as well as what turns out to be a pretty good read on the history and origins of one mother of a grisly stocking stuffer.
Origin of the Shrunken-head Trade [head-hunter.com]