Kansas Citys two polar bears are mating, raising hopes for a cub.
Officials at the Kansas City Zoo probably wont know until fall if Berlin, a 23-year-old female who arrived here late last year, is pregnant by 6-year-old Nikita.
Zookeepers noticed that Berlins usual disdain for Nikita began to change recently, and she was exhibiting behavior suggesting she was in heat. In recent days, the two massive bears have been observed mating.
Berlin has never had cubs, and Nikita has never been paired before.
| Matt Campbell, firstname.lastname@example.org