American Bison on Antelope Island
Fossil records show that these bison have evolved and expanded across the north hemisphere in North America , Europe and Asia since the last ice age. In North America, several species of bison are thought to have thrived after the arrival of the first humans and the extinction of most of the ancient megafauna and other predators, such as the saber-toothed cat and dire wolf. The lack of competition for grazing across the vast prairies meant virtually no limit to population growth, considering the continent's vast size and recently extinct herds of other large herbivores.
- © 2014
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