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The Black swan Petra welcomes her "partner," a swan-shaped boat, at a small lake at the zoo in Muenster, Germany, in this March 9, 2007, file photo. Petra became so attached to the boat in 2006 that she refused to leave its side, and its owner allowed the boat to be moved to the zoo. However, Petra met a live swan this winter, and she and her new mate - a white swan - are building a nest together. The boat is to be returned to its owner on Thursday.

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