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Lake Turkana is a large lake in Kenya, East Africa. This part of Africa was home to some of the first humans. Here, archaeologists have found piles of bones (both human and animal) and collections of stones that humans used as tools . By carefully uncovering and examining these remains, scientists have started to put together the story of our earliest ancestors. In 2001, a 4-million-year-old skeleton was uncovered in the area. Although a link between it and modern-day humans has not been established, the skeleton shows the species was walking upright.