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This purple urchin Paleopneustes cristatus is seldom seen by itself, and can be found in groups of hundreds.
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Purple Sea Urchin

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Pink crustose algae covers the surface of a rock.
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Encrusting Pink Algae and a Seastar

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An underwater photo of coral recovering from a bleaching event.
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Resilient Coral

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Many medicines were based on a chemical from the sea sponge Tectitethya crypta.
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From Sea Sponge to HIV Medicine

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This queen parrotfish scrapes algae from Caribbean reefs with its parrot-like beak.
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From Despair to Repair: Protecting Parrotfish Can Help Bring Back Caribbean Coral Reefs

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A blue parrotfish hides among coral.
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Tough Teeth and Parrotfish Poop

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Giant clams are one of the many wonders of coral reefs. They can grow up to five feet wide, weigh over 400 pounds, and live for 100 years!
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Restocking Giant Clams

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Convict surgeonfish are the roaming sheep of the reef but, instead of noshing on grass, they feed on algae.
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Surgeonfish: Indicators of a Healthy Reef

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J. Murray Roberts studies and maps the cold-water corals known as Lophelia in the North Atlantic.
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Exploring the Blue Planet with J. Murray Roberts

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Black coral, primnoid coral, and feather stars flourish deep on the pristine Davidson Seamount.
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Amy Baco-Taylor: Passionate about Deep-Sea Corals

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A small gray fish with two orange stripes, hides in between corals.
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Tiny Fishes Fuel Coral Reefs

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A coral has just spawned. Each of the hundreds of polyps releases a small pink bundle of sperm and eggs.
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A Tale of Sex and Stress in the Ocean

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