Beyond their value for classification and evolutionary relationships, changes in the size and shape of the hominin face through time can reflect important functional adaptations. The recently-recovered, well-preserved Australopithecus skulls — especially the 3.67-million-year-old skull known as StW 573, or ‘Little Foot,’ from Sterkfontein in South Africa — have substantially enriched the fossil record. Although StW 573 is nearly complete,...
