Grand Teton park . Drawing on fossil evidence , he also introduces the large animals that thrived 21 ,000 years ago - dire wolves , short-faced bears , American cheetahs , and mammoths - and that quickly died off at the end of the last glaciation . He recounts the coming of humans to the region , the ascendance of the ecosystems we see today , and the lasting features (plant , animal and topographical ) of the ice age . This guidebook , along with its companion on the ice-age history of Alaskan...











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