Polar bear meant to serve as mentor for Nora has died

The Oregon Zoo is mourning the death of one of its polar bears, who was euthanized on November 18.Tasul, a 31-year-old polar bear, was the third-oldest polar bear in any North American zoo.The bear was going to be a mentor to Nora, the polar bear who was born and raised at the Columbus Zoo before going to the Oregon Zoo.Veterinarians found a mass on Tasul’s ovary during an ultrasound and discovered it was cancerous. The cancer had spread extensively and staff decided to euthanize to preven