Environmentalists Examine Rare Giant Clams In The Philippines

BOLINAO, PHILIPPINES - JANUARY 23: Belgian socio-cultural ecologist Paul Van Doorn holds a Tridacna Gigas, a type of Giant Clam, in a small sanctuary January 23, 2004 near Bolinao in the Northern Philippines. The clams, prime builders for coral reefs and providing shelter for spawning fish and other marine life, are exposed by low tides in the sanctuary. Overfishing and pollution throughout the country are not only threatening food security, but are also starting to choke one of the few working clam sanctuaries in the world. (Photo by David Greedy/Getty Images)