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A couple inches wide and up to ten feet long, the bobbit worm stays hidden under tropical sands with just its five antennae poking out—waiting for prey to swim by.
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The Bobbit Worm

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 Scientist Martha Nizinski holds a specimen of a fan sponge (Phakellia sp.) collected at a deep-sea coral study site off the coast of South Carolina.    
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Fan Sponge

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Coral scientist Dr. Amy Baco-Taylor observed corals like these on her first submarine dive to a deep-sea coral bed off the coast of Hawaii.
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Deep-Sea Coral Community

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The Phoenix Islands Protected Area site in Kiribati was inscribed on the World Heritage List in 2010. The site encompasses one of the world's largest intact oceanic coral archipelago ecosystems, together with 14 known underwater seamounts and other deep
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Phoenix Islands Protected Area, Kiribati

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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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Many species of pink coralline algae, which cements coral reefs together, cover a reef surface in the Southern Line Islands.
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Pink Coralline Algae

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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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Pink crustose algae covers the surface of a rock.
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Microbes Help Corals Pick a Home and Settle Down

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A coral head in the Mesoamerican Reef has both bleached and living coral. The white sections are bleached and the brown parts still contain zooxanthellae, the symbiotic algae that provide food to their coral hosts.
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Coral Under Pressure: Monitoring Bleaching In Real Time

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Walter Adey and the NMNH coral reef tank
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The Evolution of a Reef Aquarium

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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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After ocean scientists sort deep-sea coral samples into their different types, they measure and photograph the specimens.
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Studying Deep-Sea Corals

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