JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY
Australopithecus africanus skull. This skull consists of two fossils: STS-71 and STS-36. STS-71 is the upper specimen, discovered in 1947, in Sterkfontein, South Africa. STS-36 is the lower jaw, discovered in the same location but not connected to STS-71 until 1972. The fossils are thought to be around 2.5 million years old. A. africanus is one of several extinct species forming an early part of the human evolutionary tree.
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