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

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

The Phoenix Zoo lost its beloved mountain lion, Sierra, who was humanely euthanized this week after dealing with advanced renal failure. The Reid Park Zoo had to humanely euthanize their African lion, ...

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

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

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

According to the zoo, more than $5.3 million was raised to build a new habitat for mountain lions and jaguars. Here's what ...

The Phoenix Zoo announced that its brand new habitat, Big Cats of Arizona, will hold its grand opening in April. The state-of ...