JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY
Homo ergaster skull. This skull consists of two fossils: SK-847 (main) and SK-15 (lower jaw). The fossils are those of an extinct species that forms an early part of the human evolutionary tree. However, the identification is not certain. Some have classified SK-847 as Homo ergaster. Others have identified it as Homo habilis, or even Paranthropus robustus. Because SK-847 was assembled from three fragments, the dating is uncertain. The fragments were discovered in the 1940s, 1950s and 1960s in Swartkrans, South Africa, and date to around 1.5 million years ago. SK-15 (Homo erectus) was found at the same site.
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