Off the coast of Japan lie perfectly geometric circles two metres wide pressed into the seabed, and divers who filmed them in 2011 learned they were courtship sculptures built grain by grain over a week by a pufferfish barely the size of a human hand.

Off Amami Oshima, a 12-centimetre pufferfish spends a week building two-metre sand sculptures so geometric they were mistaken for mysteries until 2011 — courtship architecture from a species not named until 2014. The post Off the coast of Japan lie perfectly geometric circles two metres wide pressed into the seabed, and divers who filmed them in 2011 learned they were courtship sculptures built grain by grain over a week by a pufferfish barely the size of a human hand. appeared first on Space Da