At the end of March 2008 , Markus RÃ bke , one of the zookeepers who helped raise Knut , said the bear should leave the zoo to help him get used to living alone . At the end of March 2008 , Markus RÃ bke , one of the keepers who helped rear Knut , reported that the bear should leave the zoo as soon as possible in order to help him acclimate to a life alone .