989. Where a thing is carried or strays onto the land of another by the effect of a natural or superior force, the owner of that land shall allow the thing to be searched for and removed, unless he immediately searches for it himself and returns it.
The thing, whether object or animal, does not cease to belong to its owner unless he abandons the search, in which case it is acquired by the owner of the land unless he compels the owner of the thing to remove it and to restore his land to its former condition.