A herd of elk graze in the meadows of Yellowstone National Park with the background Mount Holmes, and Mount Dome, in Wyoming. Government agencies killed more than 6,000 wild bison leaving Yellowstone National Park over the last two decades - the grisly result of efforts to contain a serious livestock disease carried by the animals. Thousands of elk in the region also carry the disease, brucellosis, but are not managed similarly. Transmission occurs mainly through direct contact with birthing matter, but state and federal officials have included hundreds of male bison in their slaughter, contending that males still present a risk. There has been no documented case of brucellosis transmission in the wild between cattle and bison.
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