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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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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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Fossil mosasaur skull and partial skeleton sitting in what looks like the dirt it was excavated from.
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If You Build An Ocean, Sea Monsters Will Come

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Vertebrates evolved in the sea and eventually moved onto land. The ancestors of whales later returned to the sea.
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Whales Returned to the Sea

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A close up view of Phoenix and the rough patches of skin known as callosities that are found on all North Atlantic right whales.
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Phoenix’s Callosities

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This urchin (Echinocrepis rostrata) leaves tracks as it moves across the ocean floor.
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Deep-Sea Urchin

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A diver on the reef near Moorea collects samples.
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Research Diver in Moorea

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North Atlantic right whales migrate seasonally along the eastern coast of the United States.
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North Atlantic Right Whale Territory

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A view of the injured fluke belonging to Phoenix’s mother, Stumpy. It is not known what caused this injury. It possibly could have been an entanglement.
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Stumpy’s Tail

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