Wolves and Bison in Yellowstone National Park (image) Utah State University Share Print E-Mail Caption In Yellowstone National Park, wolves cautiously stalk bison. Utah State University ecologists report wolves seldom hunt bison, though plentiful, because the latter is dangerous prey. Instead, wolves pursue elk, a scarcer yet safer target. Credit Daniel Stahler, NPS Usage Restrictions Please credit Daniel Stahler, NPS Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.