MUENSTER, Germany - Petra the black swan has been reunited with her beloved swan-shaped paddleboat after a failed romance with a real bird. Officials at a Muenster zoo where Petra has been spending the winter took her to a nearby lake Friday and released her next to the paddleboat — shaped like a giant white swan. Petra became so attached to the boat back in 2006 that she refused to leave its side. When winter came around, she and the boat were taken into the zoo. In recent months, Petra had struck up a relationship with a real white swan....