Petra, a black swan, became a minor celebrity in 2006 when she became so attached to the boat - which is shaped like an oversized white swan - that she refused to leave its side.
Officials in the western city of Muenster decided to let her stay with it over the winter, bringing both bird and boat into a city zoo.
However, Petra met a live swan this winter. Zoo director Joerg Adler says she and her new mate - a white swan - are building a nest together.
The boat is to be returned to its local owner on Thursday.
