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Giant clam

The Giant Clam (Tridacna gigas) is the largest living bivalve mollusc.

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 400 pounds and measure as much as 1.5 meters across.

The numbers in the wild have been greatly reduced by extensive harvesting for food and aquarium trade.

Note:   The above text is excerpted from the Wikipedia article "Giant clam", which has been released under the GNU Free Documentation License.
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