The place where we stayed in Costa Rica was peppered with little holes in the ground. The holes were inhabited by crabs, although you wouldn't have known it during the day. The stealthy crustaceans came out at night, and we managed to take one by surprise walking back to the cabin from the beach. Graem illuminated him with a flashlight while I took pictures. He seemed to be doing some sort of comical dance on stage under a spotlight as he scuttled back to his hole.