Yellowstone Bison

This photo taken in Mammoth Hot Springs, Wyo., shows bison in Yellowstone National Park on Jan. 20, 2018. A federal judge has ordered U.S. wildlife officials to reconsider a decision that blocked greater for protections the park's iconic bison herds, which make up the largest remaining population of the species in the wild but are routinely subject to slaughter when they attempt to leave the park. (AP Photo/Matt Brown)