While traditional descriptions of 'savage' existence identified three common sources of sustenance: gathering of fruit and nuts, fishing, and hunting, in the 1950s, the anthropologist Raymond Dart focused on hunting and gathering as the likely organizing concept of human society in prehistory, and hunting was the focus of the screenwriter Robert Ardrey's 1961 best-seller "African Genesis". Another screenwriter, Elaine Morgan, responded to this focus in her 1972 "Descent of Woman", which parodied the conventional picture of "the Tarzanlike figure of the prehominid who came down from the trees, saw a grassland teeming with game, picked up a weapon and became a Mighty Hunter," and pictured a more peaceful scene of humans by the seashore. She took her lead from a section in Morris's 1967 book which referred to the possibility of an "Aquatic Ape" period in evolution, his name for the speculation by the biologist Alister Hardy in 1960. When it aroused no reaction in the academic community, she dropped the feminist criticism and wrote a series of books–"The Aquatic Ape" (1982), "The Scars of Evolution" (1990), "The Descent of the Child" (1994), "The Aquatic Ape Hypothesis" (1997) and "The Naked Darwinist" (2008)–which explored the issues in more detail. Books published on the topic since then have avoided the contentious term "aquatic" and used "waterside" instead.