For over 25 years, the endangered Mount Graham red squirrel has been quietly battling population decline atop one of ...

The zoo has grown more than 10,000 pounds of produce hydroponically since then, Burns said. That’s been enough to supplement ...

At the Desert Botanical Garden, researchers can request plants that have been catalogued over 80 years to understand genetic changes.

After a devastating wildfire, endangered Mount Graham red squirrel populations recovered through joint efforts from four ...

The endangered Mount Graham red squirrel was classified as endangered in 1987, with population numbers ranging from 35 to 550 ...

Four critically-endangered Western Santa Cruz Galapagos tortoise babies made their debut at the Philadelphia Zoo on Wednesday ...

Video footage shows the goose and the tiger, named Vera, engaged in an intense face-off during which the bird managed to ward off the predator.

Arizona’s intense summer heat puts a strain on the supply of electricity, and power companies have long turned to older, ...