Montana officials filed a lawsuit on Dec. 31 in U.S. District court alleging that the DOI and NPS have failed to keep bison populations in check at Yellowstone National Park. NPS officials say the park can support a larger herd,

Montana Gov. Gov. Greg Gianforte wants to throw out Yellowstone National Park’s new bison management plan and reduce the

Gov. Greg Gianforte and two state agencies are suing the federal government. They argue Yellowstone National Park’s new bison management plan violates federal law.

The lawsuit is the latest escalation in a decades-long fight between state and federal officials over how to manage the park's growing bison population.

Bison in Yellowstone National Park may seem calm, but approaching them is extremely dangerous. Learn why these massive animals should always be admired from a safe distance and the steps to ensure your safety while visiting the park.

State officials say they're worried about bison passing on disease to cattle outside the park—but wildlife managers say it's never happened before.