VOLKER STEGER / SCIENCE PHOTO LIBRARY VOLKER STEGER / SCIENCE PHOTO LIBRARY
Hominid skulls. Homo habilis (left) and Homo ergaster. These images were created using data from high resolution computed tomography (CT) scans of fossilised hominid skulls. H. habilis lived approximately 2.5 million to 1.6 million years ago. H. ergaster lived approximately 1.9 to 1.4 million years ago.
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