Elderly and beloved polar bear Boris humanely euthanized

It is with a heavy heart that we share the news that our beloved and elderly polar bear Boris was humanely euthanized this morning after a significant decline in his health. At 34, Boris was likely the oldest male polar bear on the planet. He had far surpassed the median life expectancy of 23.4 years for male polar bears in human care (15-18 years in the wild). In late 2017, Boris became a medical pioneer when stem cells grown from his own fat tissue were used in an attempt to help treat his arthritis. Resc