There's a mystery brewing on the coast of Maine – though it's a bit tame for murder. A 25-feet high rubber duck with the word "JOY" printed on its chest has been floating in Belfast Harbour – and no one knows why. Even harbourmaster Katherine Given is puzzled by its sudden appearance. "Everybody loves it," Given told the Bangor Daily News. "I have no idea who owns it, but it kind of fits Belfast." Given said she originally heard rumours that the duck had drifted over from Islesboro Island, located a short distance away off of Maine's shoreline. Since making the harbour its home, the inflatable animal has become a popular attraction. The duck's position has shifted some with the weather, the Daily News reported. It migrated toward the mouth of the harbour near Belfast City Landing due to a thunderstorm one afternoon. There is no telling how long the duck will remain in the water, but Given said "a lot of people" would like to see stay. In the meantime, the harbourmaster is curious to see if anyone will attempt to claim the popular attraction.