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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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Overfishing and sedimentation have heavily impacted this reef off the coast of Guam.
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Coral Reef in Distress

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These bleached corals in the Gulf of Mexico are the result of increased water temperatures.
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Bleached Corals

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Two nurse sharks hover over a baited cage
Lesson Plan

Fish Feeding

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Walter Adey and the NMNH coral reef tank
Article

The Evolution of a Reef Aquarium

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Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
Slideshow

Zooxanthellae and Coral Bleaching

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A zoomed-in image of the crown-of-thorns sea star.
Article

A Plague of Sea Stars

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Photograph of a bristly brown and white worm, with one end pressed against a pale green coral.
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Fireworm Takes on Fire Coral

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A bluefin trevally swims in Hawaii’s Maro Coral Reef, part of the Papahānaumokuākea Marine National Monument.
Slideshow

Two Views of Coral Reefs: Thriving and Threatened

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The Peninsula Valdes in Argentina was inscribed on the World Heritage List in 1999. The site is home to important breeding populations of the endangered southern right whale (Eubalaena australis), southern elephant seal (Mirounga leonina), and southern sea
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Marine World Heritage Photo Gallery

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Intense volcanic CO2 vents in Ili Ili Bua Bua, Normanby Island, Papua New Guinea.
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Will Coral Reefs Survive Acidification?

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Pygmy Seahorse Blends Into its Environment
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Eye to Eye With a Pygmy Seahorse

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