 It was based on research begun in 1970 and summarised in a paper dated July 1973 ('Notes on the hairy man, wild man or yahoo', National Library of Australia MS 3889), at which time the yahoo had long been forgotten and nothing had been heard of the alleged yowie.He has since explained that the book was published to promote the former and to counter, not to endorse, the then new and extraordinary claims about the latter (Joyner 2008, p. 10).According to Joyner, the notion of the yowie arose following a review in a Sydney newspaper of John Napier's 1972 book Bigfoot