Mictyris longicarpus is a species of crab that lives on sandy beaches from the Bay of Bengal to Australia; with other members of the genus Mictyris, it is "one of the most loved crabs in Australia".
As you can see on photos above they build their home digging a deep hope in the sand on a beach. Down in the hole this crab is making sand balls and later push them up to the surface, 2-3 balls at a time. Pushing sand balls far from the hole they form a kind of sand ball flower or sand ball galaxy.
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