/tags/polar-bear polar bear en-US Copyright Thu, 27 Apr 2017 14:26:01 GMT /news/2017-04-27/columbus-zoo-euthanizes-nanuq-29-year-old-polar-bear The Columbus Zoo and Aquarium in Ohio says it has euthanized a 29-year-old male polar bear after veterinarians determined he had liver cancer with limited… Thu, 27 Apr 2017 14:26:01 GMT /news/2017-04-27/columbus-zoo-euthanizes-nanuq-29-year-old-polar-bear