Well, yes, it could be a mini slice of Australia complete with indigenous animals come to visit … or, equally, it could be an exhibit being put together for the next Mars probe to make Martians feel less intimidated by us visiting them. Certainly, the ducks aren’t intimidated by it’s sudden appearance.
I suspect, however, some artists (kids?) had fun creating this with a ton of papier-mache and a lot of time on their hands. Either way, it’s an island of wonder left floating in the marina causing heads to turn!