Zoo staff made the difficult choice to euthanize one of the zoo’s two female mountain lions, Sierra, earlier in the week. Officials said 17-year-old Sierra was suffering from advanced kidney failure.

Officials urged residents in a Sierra Madre neighborhood to be cautious after a mountain lion was spotted Thursday morning. The big cat was seen in the area of North Baldwin Avenue between East ...

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 Phoenix Zoo lost one of its longtime residents this week. Sierra, a mountain lion, was humanely euthanized due to advanced renal failure. Sierra and her sister, Mystic, came to the zoo as cubs ...

The Phoenix Zoo lost its beloved mountain lion, Sierra, who was humanely euthanized this week after dealing with advanced ...

Phoenix Zoo's mountain lion, Sierra, dies 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.

Zoo staff made the difficult choice to euthanize one of the zoo’s two female mountain lions, Sierra, earlier in the week. Officials said 17-year-old Sierra was suffering from advanced kidney ...