Nikita passes underneath her mother, Nan, during her unveiling to the media at the Toledo Zoo in 2007.
THE BLADE/DAVE ZAPOTOSKY
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Nan enjoys her new digs at the Brookfield Zoo in Chicago.
Jim Schulz/Chicago Zoological Society

Nan was moved to Chicago for breeding.
Jim Schulz/Chicago Zoological Society

Nan came to the Toledo Zoo in 2001, and gave birth to a cub, Nikita, in 2006.
Jim Schulz/Chicago Zoological Society

Nan's move to Chicago was coordinated by the Association of Zoos and Aquariums’ Polar Bear Species Survival Plan.
Jim Schulz/Chicago Zoological Society