Palaeontologists have discovered many fossils of prehistoric animals in Kenya. At one of the rare dinosaur fossil sites in Africa, two hundred Cretaceous theropod and giant crocodile fossils have been discovered in Kenya, dating from the Mesozoic Era, over 200 million years ago. The fossils were found in an excavation conducted by a team from the University of Utah and the National Museums of Kenya in July-August 2004 at Lokitaung Gorge, near Lake Turkana.
Fossils found in East Africa suggest that primates roamed the area more than 20 million years ago. Recent finds near Kenya's Lake Turkana indicate that hominids such as Homo habilis (1.8 and 2.5 million years ago) and Homo erectus (1.8 million to 350,000 years ago) are possible direct ancestors of modern Homo sapiens and lived in Kenya during the Pleistocene epoch. In 1984 one particular discovery made at Lake Turkana by famous palaeoanthropologist Richard Leakey and Kamoya Kimeu was the skeleton of a Turkana boy belonging to Homo erectus from 1.6 million years ago.