The U.S. Department of Agriculture said a Wood County farm lost much of its livestock in what an investigator determined was a wolf attack.
Thirteen sheep were found dead on Monday in the Town of Hansen, with one lone sheep surviving, according to the Associated Press.
The owner will receive compensation for the loss, said USDA wildlife biologist Dan Hirchert.
Because wolves are an endangered species in Wisconsin, farmers are currently not allowed to kill an attacking wolf and are asked to contact the USDA if they believe their livestock is in danger.
A similar attack occurred in Price County this May, with 40 sheep lost.