Why humans in Africa fled to the mountains during the last ice age 

People in Ethiopia did not live in low valleys during the last ice age. Instead they lived high up in the inhospitable Bale Mountains where they had enough water, built tools out of obsidian and relied mainly on giant mole rats for nourishment.Researchers provides the first evidence that our African ancestors had already settled in the mountains during the Palaeolithic period, about 45,000 years ago.

Source: Why humans in Africa fled to the mountains during the last ice age — ScienceDaily

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