At a time when volcanoes were being born in what is now New Mexico, clans of hunter-gatherers were already living in the Great Plains. Primordial beasts roamed the land: creatures like the giant sloth, the flat-faced bear, the woolly mammoth, and the dire wolf hunted there, often coming into conflict with their two-legged prey. When Do-na-ti reaches adulthood, he slays the badger for his ceremonial cloak. By wedding E-lo-ni, he unites their clans...