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

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 and Reid Park Zoo in Tucson are both dealing with the loss of longtime residents. The Phoenix Zoo lost its beloved mountain lion, Sierra, who was humanely euthanized this week after ...

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 cubs', Fern, Thistle, and Spruce, are about 10 months old and are 'relatively healthy' despite living without their mom for two weeks Oakland Zoo Three orphaned mountain lion cubs are in the ...

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