The Humane Society of the United States has pulled the plug on its proposal to put a measure on the November ballot to make it illegal to pursue, shoot, snare, net or capture any "wild cat.''

It may not be surprising that an “aquatic desert” turtle faces long odds in life, but environmentalists and biologists still welcomed this week’s endangered species designation for the Sonoyta mud turtle.

More than a dozen endangered Mexican gray wolves were killed in 2016, including two at the hands of wildlife officials who were trying to survey the struggling population early last year.

Two environmental groups are asking a judge to block moves by a federal agency to trap and remove predators from sections of Arizona and Texas until they ensure it won’t harm the endangered ocelot.

The federal government moved the Arizona toad closer to endangered status this week while dimming hopes for the gray wolf, which moved a step closer to losing endangered species protection altogether.

The governors of 10 Western states began a three-day meeting Wednesday in Lake Tahoe to tackle drought and other problems that don't respect state boundaries.

Lawmakers are taking aim at the endangered Mexican gray wolf, moving ahead with a host of proposals aimed at the federally protected animal in Arizona.

For the second time in less than two weeks, a Tucson-based conversation group has sued the federal government over its handling of the Mexican gray wolf.

Once employed for such mundane issues as inmate transfers, natural resource management and state boundary definitions, interstate compacts have suddenly become the latest tool for legislators looking to buck the federal government on a slew of controversial topics.

The Center for Biological Diversity has achieved its high profile in part through its litigation-based approach to conservation. Since July 1, for example, the center has filed 12 lawsuits to prevent development around the country that it contends would threaten various endangered species.