Seventy early hominids were discovered in the Sterkfontein caves during the 1947 – 1949 excavations. Sts 7 is regarded as one of the better-preserved crania in the area. It consists of over half the face and the entire right side of the braincase. It has the cranial capacity of 428 cc and a less projecting face than that of Mrs. Ples. According to Johanson & Edgar (1996), the skull was originally believed to be female, but after John Wallace, a student of Phillip Tobias, completed his doctoral thesis on the form and function of the South African australopithecines, the specimen was found to exhibit far more male characteristics. This resolution was achieved through the meticulous study of the specimen’s dentition. It was Wallace who put the Sts 71 cranium with the Sts 36 mandible, having noticed the same wear and tear in the dentition. It was concluded that the specimen was male due to the large size of the skull and the very large teeth, a very male characteristic. This specimen has been continually reevaluated since its discovery decades ago. It is a fine example of how interpretations change with more detailed study, combined with the finding of other fossils, which add additional pieces to the hominid puzzle. It is furthermore theorized that these fossils belong to two different species, as Sts 71 and Sts 36 produce complex questions about the sexual dimorphism and cranial variation of the Australopithecus Africanus.