Sen. Michael Bennet and Gov. John Hickenlooper asked the government to stop plans for oil and gas drilling on habitat for the greater sage grouse.
Greater Sage Grouse
A U.S. judge ruled that federal wildlife officials had illegally denied protections for the bird in 2015.
Some governors in the U.S. West say a new Trump administration directive threatens to undermine a hard-won compromise aimed at saving a beleaguered bird scattered across their region.
There are between 200,000 and 500,000 sage grouse in the West, down from a peak population of about 16 million.
Wednesday's proposal affects conservation plans for grouse in Wyoming, Idaho, Nevada, Colorado, Utah, California and Oregon.
Lawsuits claim the Trump administration ignored policies meant to protect the greater sage grouse when it sold oil and gas leases in Montana, Wyoming, Utah and Nevada.
The agency announced it's working with the U.S. Bureau of Land Management in a coordinated review.
Both western governors appeared together at an energy conference at Colorado State University.
Interior Secretary Ryan Zinke announced the new strategy for the ground-dwelling bird that has suffered a dramatic population decline across its 11-state range.