Which animal has lived in Yellowstone since prehistoric times?
A Plains bison
B Gray wolf
C Grizzly bear
Bison roamed North America in the millions before they were nearly exterminated by European settlers. Protections were put into place to save them from extinction, but not before their numbers at Yellowstone were down to about two dozen bison. Thanks to conservation efforts, nearly 6,000 bison that have never been crossbred with cattle now roam the park, the only place in the US where they have lived continuously since prehistoric times.
The correct answer is Plains bison.