Goby Family Gobiidae and
Snapping Shrimp Family Alpheidae

Along the sandy mud stretches of the shore, snapping shrimps may be observed pushing small pebbles or sand grains to keep their respective burrows clear, and sharing each burrow with a goby. The goby, with its excellent eyesight, acts as a "lookout", signalling the shrimp to take cover if danger threatens. The "housekeeper" shrimp itself has poor eyesight.