After discovering a fossil at Ngon’g hills belonging to early human species Australopithecus afarensis, there is proof now that early humans lived close to Nairobi city. Kantis Fossil Site joins other early human fossil sites like Koobi Fora, Kanapoi and Nariokotome on the Eastern and Western Turkana.

The discovery of the 3.5 million year-old fossil at Kantis Fossil Site is the first specimen of the species that occurred outside the Rift valley and the first time the A. afarensis species has been discovered in Kenya. Previously were in Tanzania and Ethiopia.