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Sea anemones, brittle stars, and sea urchins make a home on mangrove roots.
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Mangrove Roots Up Close

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Flower-like clusters of pink polyps make up this coral colony.
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Coral Colony

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A hermit crab looks out from its coral dwelling in the waters of Japan's Ogasawara Islands.
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Coral Hermit Crab

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A coral has just spawned. Each of the hundreds of polyps releases a small pink bundle of sperm and eggs.
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Coral Spawning by Moonlight

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An illustration depicting many sea animals living in the Cretaceous seas off Angola.
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Cretaceous Benguela Current Ecosystem

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A female manatee and her calf are captured on film foraging in seagrass off the coast of Brazil.
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Female Manatee Foraging with a Calf on Her Back

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Guitarfish, rays, and other bycatch are tossed from a shrimp boat in La Paz, Mexico in 2006.
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Bycatch Raining Down From Above

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Mangrove Salt Glands
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How Mangroves Deal with Saltwater

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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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Pink crustose algae covers the surface of a rock.
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Encrusting Pink Algae and a Seastar

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A male mudflat fiddler crab (Uca rapax) waves its huge claw to impress females and threaten competitors.
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The Mudflat Fiddler Crab

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Scientist Martha Nizinski examines a sample of the deep-sea coral Lophelia pertusa, collected 600-m (1,969-ft) deep off the coast of the southeastern United States.
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Deep-Sea Coral Sample

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