The Blind Shrimp shares a burrow with the Goby. The Shrimp is in-charge of cleaning and digging their burrow, BUT he is BLIND. The Goby on the other hand, does not know how to dig, but has a good eyesight.... So they share Duties - The shrimp digs and the Goby watches... whenever there is a threat the Goby shakes it's tail and the shrimps disappears into the burrow. if the danger gets closer, the Goby enters too..... Beautiful relationship.