Members of the Mollie's pack surround a bison in this February 2005 photograph. The wolves try to harass the bison into deeper snow, where the bison are less of a threat and easier to attack.

Yellowstone's Junction Butte wolf pack failed in a recent attempt to kill a bison, but the pack appears to be thriving again after the death of its former alpha female, Wolf 907F.

Yellowstone's Junction Butte wolf pack failed in a recent attempt to kill a bison, but the pack appears to be thriving again after the death of its former alpha female, Wolf 907F.

The bison gored the 47-year-old man from Florida ... Florida, or give details about Sunday's attack, ... and 100 yards away from wolves and bears. Bison are North America's biggest land ...