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Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
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Coral Reef on Gangga Island, Indonesia

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These corals are dead—smothered in sediments and overgrown with algae.
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Dead Coral Overgrown with Algae

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This Marine National Monument protects a chain of atolls and reefs 1,931-kilometers (1,200-miles) long.
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Northwestern Hawaiian Islands Marine National Monument

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

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Shallow water coral reefs straddle the equator worldwide.
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Global Distribution of Shallow Coral Reef Ecosystems

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Phoenix’s mother, Stumpy (number 1004), was killed in a collision with a ship near Virginia in February 2004. She was pregnant with her sixth known calf.
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When Ships Strike

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North Atlantic right whales and ocean-going vessels often cross paths.
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Ship and North Atlantic Right Whale

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Photograph of the underside of a gelatinous octopus with a bright yellow bioluminescent ring around her mouth.
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Bioluminescent Octopod

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Colorful corals and brittlestars on Manning Seamount off the New England coast.
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Manning Seamount Deep Coral Communities

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A rendering of an underwater marine scene from the Proterozoic Eon, featuring a creature that resembles a jellyfish and other organisms.
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Ediacaran Community, Proterozoic Eon (2,500 - 542 Million Years Ago)

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A white coral (Corallium sp.) and two vase sponges (left) grow on an Atlantic Ocean seamount.
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Balanus Seamount

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A variety of corals cling to Manning Seamount, just off the coast of Cape Cod, Massachusetts.
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Manning Seamount Deep Coral Community

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