JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY
Homo ergaster fossil skull. This specimen is catalogued as KNM-WT 15000, and is colloquially known as Turkana Boy. It consists of almost a complete skeleton, and dates from around 1.5 million years ago. It was found in 1984 near Lake Turkana in Kenya. The age of this individual has been estimated as between 7 and 15 years old. This fossil is sometimes classified as Homo erectus. Both are extinct species that form part of the human evolutionary tree.
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