“A lot of good naturalists have been looking at a lot of animals for a very long time, so finding something completely new is sadly a rarity these days. But in the seas off Japan a sculptured doughnut made of sand – an ephemeral ring of ridges and points made on the wave-washed sea floor – was one exciting, and very beautiful, example of an exception to that rule.

The master architect? A puffer fish. But why do they make such a delicate and intricate structure?”

Watch the amazing video here.