i have a small groove in a rock only about 1/2" deep,2" long and something is piling about 4or5 1/2" size pieces of rubble on the top of the groove to make a tunnel,2 days ago i demolished the tunnel to see if it got built again and it has,what could do this,a very small mantis?a crab,wouldnt fit in tunnel though,it's a strange one:confused:



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