One of the reasons I'm trying to source info is years ago I managed to rent a video (tape) of the documentary "Hearts of Darkness". The doco was made by Eleanor Coppola on the making of "Apocalypse Now". In the doco there is a section showing Francis Ford Coppola desperately trying to figure out how to do the final scene (the death of Kurtz).
They had recruited a band of Ifugaos as Kurtz' soldiers; Eleanor and FFC had been invited to
witness an Ifugao ceremony slaughtering a caribou. The ceremony was used as the inspiration for
Willard killing Kurtz.
The doco has been re-released on dvd but the section (8-24) dealing with the Ifugau appears to have some footage of the slaughtering removed.
Supposedly there is quite abit of footage that Eleanor took of different Ifugao ceremonies.
http://blogs.nyu.edu/projects/materialworld/2009/03/up_the_river_ifugao_extras_and.htmlhttp://www.nativevillageinn.com/pg3.htmlhttp://www.oovrag.com/essays/essay2004a-3.shtml