However , in March 2010 , the German chapter of People for the Ethical Treatment of Animals ( PETA ) called for Giovanna to stay somewhere else . Knut and Giovanna share a grandfather , and PETA spokesperson Frank Albrecht thought the same person who had claimed that Knut should be killed would threaten the German polar bear population if they might breed . However , in March 2010 , the German chapter of People for the Ethical Treatment of Animals called for Knut to be castrated in order to avoid inbreeding ; he and Giovanna share a grandfather and , according to PETA spokesman Frank Albrecht , the same animal rights activist who spoke out about Knut 's handraising three years earlier , their offspring would threaten the genetic diversity of the German polar bear population .