Zoo staff made the difficult choice to euthanize one of the zoo’s two female mountain lions, Sierra, earlier in the week.

After 17 long years at the Phoenix Zoo, Sierra the mountain lion was humanely euthanized after experiencing renal failure, ...

The zoo said zookeepers and veterinary staff made the "difficult decision" to put down mountain lion Sierra earlier this week ...

The Phoenix Zoo lost one of its longtime residents this week. Sierra, a mountain lion, was humanely euthanized due to ...

Metro Phoenix highlights include Camelback Mountain, Old Town Scottsdale and Mexican food. Plus, tips for visiting Sedona and the Grand Canyon.

KY3 Missouri Capitol Bureau Chief Hannah Falcon reports.

Meet Phoenix, the bald eagle. Dickerson Park Zoo zookeeper Kyanne Kilger shares the backstory of one of the zoo's oldest animals.

Swinging onto a banner with a spinoff of Taylor Swift lyrics, this Memphis Zoo ape is feeling 22. See the adorable ...

The state-of-the-art space is dedicated to showcasing and caring for some of Arizona’s most elusive native predators.