This bison calf looks like it is smiling as it runs off some pent-up energy. Bison are the first of the ungulates to give birth in Yellowstone. Bison management in Yellowstone is difficult and controversial. Some of them migrate north out of the park in winter looking for forage. That puts ts them in the crosshairs of the State of Montana which feels the brucellosis some of them carry will infect livestock. The most common management solution is to shoot them.