Black swan 'Petra' welcomes her 'partner', a swan-shaped pedal boat at a small lake at the Zoo in Muenster, western Germany, in this March 9, 2007 file photo. Petra the swan didn't get far without her beloved swan-shaped paddleboat. In 2006, Petra, a black swan, became so attached to the boat — shaped like an outsized white swan — that she refused to leave its side. Officials at a zoo in the German city of Muenster finally parted bird and boat last week after Petra settled down with a real white swan. But the romance was short-lived. The zoo says that, on Saturday, her new beau flew off and sought out the company of its other black swans. (AP Photo/Frank Augstein)