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 ...

After 17 long years at the Phoenix Zoo, Sierra the mountain lion was humanely euthanized after experiencing renal failure, the zoo said on Feb. 27. She came to the zoo 17 years ago as an orphaned cub ...

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 ...