Clam, Palau, 2011

Giant Clam resting in the Ulong Channel. Note the fish on the left side of the photo is dwarfed by the size of this clam. "Clams feed on plankton by filter feeding. Clams filter feed by drawing in water containing food using an incurrent siphon. The food is then filtered out of the water by the gills and swept toward the mouth on a layer of mucus. The water is then expelled from the animal by an excurrent siphon." [Wikipedia.]