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.

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.

A long-simmering battle between Yellowstone National Park officials and the Gianforte administration in Montana came to a head on Tuesday with state officials suing the park in federal court for its bison management plan.

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.