Arizona's pygmy-owl will once more be protected under the Endangered Species Act. The U.S. Fish and Wildlife Service said Wednesday it would list the cactus ferruginous pygmy-owl as a threatened ...

PHOENIX -- Citing everything from grazing to insects, the U.S. Fish and Wildlife Service on Monday granted endangered species protection to two cacti found in Arizona. The move comes two years after ...

By analyzing the natural vibrations of a saguaro, scientists can study the cactus's insides without cutting them open.

PHOENIX (Reuters) - Arizona's saguaro cacti, a symbol of the U.S. West, are leaning, losing arms and in some cases falling over during the state's record streak of extreme heat, a scientist said on ...

Saguaro National Park is famous for its namesake giant cactus, but many might be surprised to learn that the park is home to an amazing variety of other cacti — 25 species in all. In addition to ...

TUCSON, Ariz.— Following multiple petitions and lawsuits by the Center for Biological Diversity and Defenders of Wildlife, the U.S. Fish and Wildlife Service today proposed to protect cactus ...