Author of "Prehistory of the Pedestrian", her book explains how we differ from the Australopithecus line and why they cannot be our ancestors. Instead, Yvette Deloison describes the proto-hominoid at the origin of our species as a biped living in a semi-aquatic environment. The discovery of fossil footprints in Crete dating back more than 5 million years corroborates her theory on our origins; an opinion which has been supported by eminent specialists and has, as yet, never been contested.