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The U.S. Fish and Wildlife Service is asking a federal appeals court to reinstate a rule that removed gray wolves from Endangered Species Act protections.

The Biden administration is restoring protections for threatened wildlife that had been previously dropped during the Trump presidency. The changes are minor, but they’ve sparked fierce debate about the purpose and function of the Endangered Species Act.

A coalition of environmental groups has proposed a set of new rules for managing the Colorado River amid heated negotiations about how to share the water supply, which is shrinking due to climate changed.

The Bureau of Reclamation released a draft plan for releases from Glen Canyon Dam, which holds back Lake Powell. It's an effort to protect native humpback chub from smallmouth bass.

A federal judge says she will decide by Friday whether to temporarily halt the impending reintroduction of gray wolves to Colorado under a voter-approved initiative. State wildlife officials plan to capture up to 10 wolves from Oregon and begin releasing them in Colorado by Dec. 31. The animals would be among the first gray wolves in Colorado in decades.

A federal judge is set to consider a request by Colorado's cattle industry to block the impending reintroduction of gray wolves to the state under a voter-approved ballot initiative.

After centuries of systematic efforts to eradicate wolves in the U.S., they're making a comeback. Some of their best habitat may be located in the Colorado high country.

Colorado wildlife advocates hope the wolverine can be reintroduced into the state now that it has been classified as "threatened" under the Endangered Species Act.

Grizzly bears in the Greater Yellowstone Ecosystem are adapting to climate change and other ecological pressures, a new study suggests. The study found the bears have been able to maintain healthy body fat levels over the past couple of decades despite shifting availability of popular foods and increasing population density.

This year marks the 50th anniversary of the Endangered Species Act, one of the strongest conservation laws in the world. It continues to have far-reaching impacts, especially in the Mountain West.