Over 400 individual human prints comprise the Engare Sero footprint site in Tanzania. The site was unearthed starting in 2009 by a combined team of researchers from Appalachian State University, the Smithsonian Institution, George Washington University, the American Museum of Natural History, the Tanzania Department of Antiquities, and the Tanzania Ministry of Mining and Tourism. These footprints date to between 6,000 and 19,000 years ago.