Montana wildlife officials could soon allow grizzly bear hunting in areas around Glacier and Yellowstone national parks, if states in the US northern Rockies succeed in their attempts to lift federal protections for the animals.

Grizzlies in the region have been protected as a threatened species since 1975 and were shielded from hunting for most of that time. But several states are pushing for restrictions to be eased.

Montana governor Greg Gianforte last month announced the state intends to petition the Biden administration to lift threatened species protections for Glacier-area grizzlies. Wyoming governor Mark Gordon is leading a similar push to end protections for Yellowstone area bears.

The two regions have the most bears in the US outside Alaska, the only state that currently allows hunting.

As officials seek to make the case that protections are no longer needed, Montana wildlife commissioners on Tuesday voted to sign onto a multistate plan to maintain more than 900 bears in the Yellowstone area. Wyoming already has signed onto the plan, which would allow limited hunting. Idaho officials are expected to consider it next month.

Montana commissioners also gave preliminary approval to revisions to Glacier-area bear population targets that could allow hunting of grizzlies in northwestern portions of the state if federal protections end. The rule calls for maintaining a population of more than 800 bears.

Details on any future hunting seasons would be established at a later date.

Wildlife advocates have objected to the bid to lift protections, saying state officials in the northern Rockies are intent on driving down populations of grizzlies and another predator, gray wolves.

But state officials, backed by livestock and hunting groups, say bear populations need to be more closely controlled. They cite increasing conflicts between bears and humans, including attacks on livestock and occasional maulings of people

As many as 50,000 grizzly bears once ranged the western half of the US. Most were killed by hunting, trapping and habitat loss following the arrival of European settlers in the late 1800s. Populations declined to fewer than 1,000 bears in the lower 48 states by the time they were given federal protections in 1975.

The last grizzly hunts in the US outside Alaska were in the early 1990s, under an exemption to protections that allowed 14 bears to be killed each fall in Montana.

When Yellowstone grizzlies briefly lost protections under Donald Trump’s administration, Wyoming and Idaho scheduled hunts for 22 bears in Wyoming and one in Idaho, with hunting permits offered by lottery. A federal judge stepped in at the last minute and restored protections, a decision later upheld by the ninth US circuit court of appeals.

The US Fish and Wildlife Service recommended in March to keep threatened-species protections for grizzlies. The agency cited a lack of connections between the bears’ best areas of habitat and people killing them, among other reasons.