[Ground Keeper]
The Soldier Crabs are well-known for their movement forward in massive groups instead of moving from side to side. They live in the sandy estuaries and mangroves of Ryukyu Islands and feed organic matter included in the sand, then spit numerous unnecessary elements rolled up into rice-grain sized balls onto the tidal land. The number of pellets is becoming less. There might be ones who choose to be fugitives or spys and move at night hiding themselves from people's eyes. The day may come when we can't find them any more or their name might change to a different one, like Spy Club...?