Two extinct hominins, Australopithecus afarensis and Australopithecus africanus, were significantly more dimorphic than chimpanzees and modern humans; Australopithecus afarensis were also significantly more dimorphic than Australopithecus africanus, according to Dr. Adam Gordon, a paleoanthropologist at the University at Albany and Durham University. Forensic facial reconstruction of Australopithecus afarensis. Image credit: Cicero Moraes / CC BY-SA...
