Heart cockles have shells with built-in skylights to let in light for symbiotic algae. Photo by Dakota McCoy (IMAGE)

Duke University

Heart cockles have shells with built-in skylights to let in light for symbiotic algae. Photo by Dakota McCoy

Caption

Heart cockles have shells with built-in skylights to let in light for symbiotic algae. Photo by Dakota McCoy

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Photo by Dakota McCoy

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Please credit Dakota McCoy

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