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Camels originated in N America, spreading westwards over Beringia into Eurasia. Most camel diversity remained in N America, though most species went extinct in the Pleistocene. The last survivor in N America, camelops hesternus, was killed off by Amerindians by 9000 BC.
Sintashta built circular fortified settlements on islands in floodplains. Their walls could be 5-6 meters high, & were made of stone, earth, & wood.