In case you didn’t know, Yellowstone National Park is currently blanketed in snow. That’s closed down a lot of roadways throughout the park’s sprawling property, but it hasn’t stopped the wildlife from participating in their regularly scheduled activities. Like wolves trying to make a meal out of bison.

The suit concerns brucellosis, a bacterial disease that infects cattle, swine, goats, sheep and dogs and can spread to humans.

The National Park Service’s plan to increase bison herd sizes has drawn criticism from state officials concerned about disease transmission.