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This bait ball shows how small fish can react when larger predators are near, gathering tightly together in a ball-like formation that exposes the least number of fish.
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Bait Ball

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A sea butterfly, or sea snail, swims in the open ocean.
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A Swimming Snail

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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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The West Norwegian Fjords's two fjords, among the world's longest and deepest, are considered archetypical fjord landscapes and among the most scenically outstanding anywhere.
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West Norwegian Fjords – Geirangerfjord and Nærøyfjord, Norway

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map of the 13 marine protected areas in the United States, that comprise the National Marine Sanctuary system
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Marine Sanctuary Map

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A young Kemp's ridley sea turtle in recovery.
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Kemp’s ridley sea turtle recovers from oil

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In this photo of a shallow coral reef in the Pacific there are three species of forams. Their colors come from the symbiotic algae that live inside the foram shells.
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Shallow Coral Reef Foraminifers

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X-ray image of a longnose butterflyfish
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X-Ray Image of a Longnose Butterflyfish

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The Belize Barrier Reef Reserve System consists of the largest barrier reef in the northern hemisphere, offshore atolls, and several hundred sand cays, mangrove forests, coastal lagoons, and estuaries. The system's seven sites illustrate the evolutionary h
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Belize Barrier Reef Reserve System

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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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A bull shark's ability to prey on many different species is helped by its capacity to survive in both freshwater and saltwater.
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Swinging for Bull Sharks

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The Everglades National Park in the United States was inscribed on the World Heritage List in 1979. This site is a unique ecosystem created by a shallow, "imperceptible river" 50 miles wide, flowing slowly south to the tip of Florida. The exceptional varie
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Everglades National Park, United States

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