Researchers killed two Yellowstone National Park bison were killed after they fled a science experiment to Yankee Jim Canyon, where bison aren't allowed because of concerns about brucellosis.

When the two bull awoke they fled Montana officials and headed into Yankee Jim Canyon, refusing to leave. After several attempts to guide the bison out of the canyon, the call was made by Montana and National Park Service officials to kill the pair. 

Pretty senseless.

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