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Diver With Giant Clam

Exposing its mantle and inhalant siphon, a giant clam (Tridacna gigas) is in the ideal position for a diver's examination in the Coral Sea off the coast of Queensland, Australia. While in their larval stage, giant clams must swim and feed in the water column. But once they grow to adulthood, these largest of bivalve mollusks permanently affix themselves to surfaces such as sand or coral reef rubble.

Photograph by Gordon Gahan