The cubs — named Fern, Thistle, and Spruce — are just 3 months old. Zoo gives much-anticipated health update on 'thin' ...

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

The Reid Park Zoo announces that Kaya the Lion has passed at the age of 17. Kaya was recently diagnosed with a degenerative ...

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

Kaya, an African lion that had been at Tucson's Reid Park Zoo since 2009, was euthanized last week after a degenerative spinal disease made movement difficult, officials said. Kaya had been at the zoo ...

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

Reid Park Zoo announced Friday that a 17-year-old African lion named Kaya was euthanized this week. Kaya was recently diagnosed with a degenerative spinal disease that impeded her ability to move her ...

Reid Park Zoo announced the passing of Kaya, an African lion, who was humanely euthanized at age 17. Kaya had been diagnosed ...

Timber and Thorn, as the babies were named, were found separately alone in Alaska and, since they were too young to survive ...