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This episode is about our ancestors and some unusual animals that shared their habitat. We are looking at Ethiopia at around 3,2 million years ago. The great African Rift Valley had been created by rifting and the separation of the African and Arabian tectonic plates. (22) Millions of years had transformed the dense African forests into vast tracts of grassland. And this has brought new species of grazing mammals. It is the Pliocene epoch and climates slowly became cooler and drier with more distinct seasons. Africa was dominated by hoofed animals and primates continued their evolution with the first australopithecines making their appearance. (23)