Here is a picture of Giant Clams
on Kingman Reef, ( Kingman Reef 6.59200000762939 -162.735000610352 ) with their mouths closed.
near Palmyra Atoll, Kiribati, South Pacific Ocean. No two giant clams have the same coloration patterns, making each unique and beautiful like giant butterflies onteh bottom of the ocean.
The largest giant clam, Tridacna gigas, (known as pāâ€™ua in Cook Islands), is the largest living bivalve mollusc.
There is no larger bivalved animal in the fossil record, these are living giants!
One of a number of large clam species native to the shallow coral reefs of the South Pacific and Indian oceans, they can weigh more than 200 kilograms (440 lb) measure as much as 120 cm (47 in) across, and have an average lifespan in the wild of 100 years or more.
Its range covers the Indo-Pacific oceans, but populations are diminishing and the giant clam has become extinct in many areas where it was once common due to harvesting for human consumption.
The giant clam has been historically misunderstood in times past as the killer clam or man-eating clam, and reputable scientific and technical manuals once claimed that the great mollusc had caused deaths; versions of the U.S. Navy Diving Manual even gave detailed instructions for releasing oneself from its grasp by severing the adductor muscles used to close its shell. Like other clams, it feeds on small organisms and algae in the water.
More information can be found:http://en.wikipedia.org/wiki/Giant_clam
More pictures of Giant Clams:http://www.bing.com/images/search?qpvt=Giant+clam+and+scuba+diver&q=Giant+clam+and+scuba+diver&qft=+filterui:photo-photo&FORM=hphot3