Giant clams (Tridacna maxima) symbiotically photosynthesize in the shallow, sun-drenched lagoon of Orona Island, an uninhabited atoll in the Phoenix Islands Protected Area.

Giant clams (Tridacna maxima) symbiotically photosynthesize in the shallow, sun-drenched lagoon of Orona Island, an uninhabited atoll in the Phoenix Islands Protected Area. Image courtesy of Dr. Randi Rotjan/PIPA.

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