Some time ago I dug out a pond on my piece of land in a small rural town in New Zealand. The intention was to attract wild ducks there and maybe have some domestic ducks, which I told all my neighbours.
Almost a year ago a couple of white domestic ducks showed up in the pond. They have been living there since then, occasionally fed by myself. None of my neighbours have any idea where they came from and who the owner could be (at least this is what they are telling me). The pond is rather prominent in the town so most locals now know that the ducks are there, still noone has ever shown up to say they are the owners.
Can or could I ever legally claim the ducks?