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Two different populations of a prairie bird that lives in parts of the Mountain West were listed under the Endangered Species Act by the U.S. Fish and Wildlife Service.

The decades-long debate continues regarding whether wolves in the Northern Rocky Mountains should be federally protected.

The U.S. Fish and Wildlife Service is proposing a regulation change under the Endangered Species Act that would allow some species to be introduced outside their historical ranges. With more flexibility some endangered and threatened species could be moved to other suitable habitats.

U.S. wildlife officials have agreed to craft a new habitat plan for the snow-loving Canada lynx that could include more land in Colorado and other western states where the rare animals would be protected, according to a legal agreement made public Tuesday.

As grizzlies move beyond the boundaries of the Northern Continental Divide Ecosystem and create conflict, Montana seeks full management authority.

The lesser prairie chicken could receive federal protections under the Endangered Species Act in parts of the Mountain West.

This week, the northern spotted owl and the monarch butterfly were denied protections under the Endangered Species Act, even though both animals qualify.

The U.S. Fish and Wildlife Service removed protections Thursday for the gray wolf under the Endangered Species Act in the lower 48 states.

Federal lands are much better at reducing habitat loss and protecting endangered species than private lands, according to a new study out this week by...

A nonprofit conservation group is launching what it says is one of the largest lawsuits ever brought under the Endangered Species Act.