This fish creates large underwater 'crop circles' for mating purposes.
The pufferfish species found off Japanese islands creates underwater crop circles or large geometric structures for attracting a mate.
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Males dig valleys at various angles in a radial direction constructing nests surrounded by radially aligned peaks and valleys.
They laboriously flap their fins as they swim along the sea floor resulting in this amazing pattern.
The structures can have a diameter of around seven feet, while the fish is about five inches long.
The male even decorates its masterpiece with shells. If the female approves of the nest, they proceed to mate.