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Bison graze in Yellowstone National Park. Earthjustice's Northern Rockies office has fought to protect wildlife in this region for 25 years. (National Park Service)
Press Release February 24, 2025

Fort Peck Tribes, Conservation Groups Move to Defend Yellowstone Bison Plan in Court

Motion to intervene filed in Montana suit over Yellowstone’s plans for America’s national mammal

A small group of bison roam the Snake Butte Pasture on the Fort Belknap Indian Reservation in Montana. (<a href="http://conservationmedia.com/">ConservationMedia</a>)
Article November 1, 2023

In Montana, Wild Bison Are Back, and an Entire Ecosystem Is Healing

The return of bison ten years ago to their home on tribal lands at the Fort Belknap Indian Reservation has helped restore an ecosystem and tribal culture.

A bison grazes at American Prairie.
(Ami Vitale for Earthjustice)
feature October 7, 2022

How We Helped Bison Make a Huge Comeback

Earthjustice is using the power of the law to restore and recover wildlife — including bison.

The Gallatin Range in Southwest Montana. (Jared Lloyd / Getty Images)
feature April 21, 2025

The Intermountain West: Regional Spotlight

Our teams in Bozeman, Montana, and Denver, Colorado, have spent decades fighting to safeguard biodiversity, to advance a just transition to clean energy, and to protect people’s health. We’re pleased to share highlights of our progress, and a glimpse at what’s next.

document February 24, 2025

Motion to Intervene: Yellowstone Bison

The Fort Peck Assiniboine and Sioux Tribes, alongside conservation groups, filed a motion to join a lawsuit to defend Yellowstone National Park’s science-based bison management plan.

U.S. President Donald Trump speaks during inauguration ceremonies in the Rotunda of the U.S. Capitol on Jan. 20, 2025, in Washington, D.C. (Kevin Dietsch / Getty Images)
feature April 29, 2025

Where the Trump Administration is Going and Where We Stand

Tracking how Earthjustice is holding the Trump administration and Congress accountable — while making progress in states, in public utility commissions, and overseas.

Press Release August 29, 2022

American Prairie to Defend Bison Grazing on North-Central Montana Public Lands

Earthjustice to represent American Prairie in the appeal

Press Release May 24, 2011

Groups Seek To Shield Bison From Over-reaching Lawsuit

Winter foraging north of Yellowstone Park at issue

Press Release June 19, 2013

Montana's Highest Court Clears Way for Return of Wild Bison

Bison transfer to Fort Belknap tribes to proceed

Press Release April 8, 2014

Victory for Wild Bison in Montana

Montana judge rejects effort to classify wild bison as“livestock”

Press Release: Victory January 7, 2013

Court Rules Bison Can Roam

Rejects unreasonable demand to return to widespread buffalo slaughter

One of the newborn bison calves, born at Montana's Fort Peck in the spring of 2012.
(Bill Campbell for Earthjustice)
Article October 16, 2013

Bison: Wildlife or Livestock?

As wild bison return to the plains, ranchers target them as livestock

Press Release August 14, 2008

Horse Butte Residents Seek to Shield Bison from Stockmen Lawsuit

Bison safety on prime spring calving grounds at stake

One of the newborn bison calves, born at Montana's Fort Peck in the spring of 2012.
(Bill Campbell for Earthjustice)
Article August 23, 2013

More Wild Bison Return Home To Montana

Some extra thunder rumbled into north central Montana, when wild bison finally set hooves on the ground at Fort Belknap Indian Reservation. The return was the culmination of legal efforts to restore the animals to their historic prairie habitat. Members of the Assiniboine and Gros Ventre tribes were eager to receive them.

Press Release March 12, 2014

Montana Supreme Court Affirms Bison Can Roam

Rejects unreasonable demand to return to widespread buffalo slaughter

Article May 25, 2012

Scofflaw Bison Occupy Private Grazing Lands Near Yellowstone

A group of 27 bison occupying privately owned grazing lands outside of Yellowstone National Park’s western border were detained by authorities on May 24. The group of animals included 12 newborn calves, 12 mothers, and three juveniles. The Montana Department of Livestock led the raid with support from the Montana Department of Fish, Wildlife, and…

Bison are the only native wildlife species still unnaturally confined to the political boundaries of Yellowstone National Park for any part of the year.
(J. Schmidt / NPS)
case: Victory January 7, 2013

Bison Return to Ancestral Lands

Bison are the only native wildlife species still unnaturally confined to the political boundaries of Yellowstone National Park for any part of the year. In 2008, more than 1,400 bison—about one-third of the current size of Yellowstone’s bison population—were captured and slaughtered by government agencies while leaving Yellowstone in search of food. Federal and state…

Press Release: Victory May 28, 2010

Court Rejects Stockgrowers' Demand to Haze or Slaughter All Horse Butte Bison

Cattle conflict non-existent