A mountain lion stays close to its deer kill in Sabino Canyon. Lions who prey on bighorn sheep will be killed, state wildlife officials say.
A pair of bighorn sheep pause on a ridge overlooking Oro Valley. A herd of bighorn sheep, which died out in the late 1990s, will be brought back to the Pusch Ridge area in November.
An already "robust" population of mountain lions in the Catalina Mountains appears to be increasing - and that could pose a threat to a planned reintroduction of bighorn sheep in the range this fall.
Bighorn sheep, like these two on a ridge overlooking Oro Valley, will once again take their place in the Catalina Mountains.
Bighorn sheep - a species that was practically the symbol of the Catalina Mountains before the herd there died out in the 1990s - will soon roam the range again.
A terrestrial snail found near the planned Rosemont copper mine no longer is a candidate for federal endangered-species protection.
The Southwestern willow flycatcher has been listed as endangered for 17 years. It reproduces in the Southwest.
Seventeen years after the Southwestern willow flycatcher became a federally endangered species, it has gained what appears to be the final version of its critical habitat.
Environmentalists are filing another lawsuit over the federal government's handling of endangered Mexican gray wolves, this one seeking to stop a policy that calls for the capture of any wolves that cross the border into Arizona and New Mexico.
A Tucson-based environmental group plans to distribute 50,000 free condoms across the U.S. through the holiday season as part of a campaign aimed at calling attention to the impact of human population growth on wildlife.
PHOENIX - Saying federal officials continue to ignore the law, environmental groups are going back to court to force the Fish and Wildlife Service to get the desert bald eagle listed as endangered.
ALBUQUERQUE - An environmental advocacy group has proposed that federal officials set aside millions of acres in Arizona and New Mexico for a jaguar reintroduction program.
A small, little-known cactus found in Organ Pipe National Monument west of Tucson faces a "high and immediate" threat of extinction, says the U.S. Fish and Wildlife Service in proposing to protect it as an endangered species.
A female Mexican gray wolf wanted for killing too many cows in southwestern New Mexico was captured Wednesday following an extensive search, U.S. Fish and Wildlife Service announced.
This male pygmy owl was sighted in the Altar Valley area on Arizona state land near Three Points in August 2003.
Conservation groups have sued to restore endangered status protection for small owls found in Southern Arizona.
Conservation groups have sued to restore endangered status protection for small owls found in southern Arizona.
The jaguar above was photographed by a remote camera in an isolated canyon of the Sonoran Sky Islands, 30 miles south of the border.
The U.S. proposed Friday to designate about 1,309 square miles across Southern Arizona and a sliver of New Mexico as prime habitat that is essential for conservation of the endangered jaguar.
FLAGSTAFF — A group of conservationists sued the U.S. Environmental Protection Agency on Thursday to force regulation of the leading killer of endangered California condors.