When Flocke , a female polar bear , was born at the Nuremberg Zoo in December 2007 , Bild named her Mrs. Knut , suggesting that the two German-born polar bears might become mates . When Flocke was born at the Nuremberg Zoo in December 2007 under similar circumstances , Bild dubbed her Mrs. Knut , suggesting that the two German-born polar bears might become mates when they matured .