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 ...

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 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, ...

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 ...

If you need a break from the noise of social media or the craziness of work, there's nothing more relaxing and uplifting than a quiet walk through nature. From preserved forests in the heart of ...

The three rescued cubs were relatively healthy but thin after it was determined the mother was absent for about two weeks before their rescue, zoo officials said.

EL PASO, Texas (KFOX14/CBS4) — The City of El Paso invites people to the zoo on Saturday as mountain lions are set to predict who will win Super Bowl LIX. At 1 p.m., the El Paso Zoo mountain ...