Crab Galaxies
Some crab species burrow homes into sandy beaches. As they dig, they form sand and dirt into small spheres, which they then push to the surface. When large colonies of crabs are active, they can form unintentional but intricate and beautiful patterns, such as this one in Thailand. You can view many more pictures at the link.
Link -via Kuriositas | Photo: Flickr user Jody McIntyre
