Yellowstone National Park staff had to euthanize a newborn bison calf after a park visitor tried to help the struggling animal near a riverbank but caused the herd to reject it, officials said. After ...

Euthanization of wildlife in national parks "is an extremely rare occurrence." — -- A bison calf recently had to be euthanized at Yellowstone National Park after visitors put it in the back of ...

Officials at Yellowstone National Park say they were forced to put down a newborn bison calf after another unfortunate encounter between a park visitor and wildlife, according to the National Park ...