More than 1000 Bison have been slated for execution in Yellowstone National Park, the most in the last 10 years.

The Bison kill is intended to reduce the risk of brucellosis being transferred from Bison to neighboring cattle. Although no cattle have been found to be infected by brucellosis, transferred by Bison, the kills have continued since 2000, even in areas where cattle no longer graze.

Approximately 4700 bison live in Yellowstone as of late 2007, the largest remaining herd in the world.