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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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Color illustration of an ancient bivalve.
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Elevator Rudists

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This family tree shows how the ancestors of whales moved gradually from land to sea.
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The Whale Family Tree

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An artistic rendering of an ocean landscape as it may have looked during the Archean Eon.
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The Ocean Throughout Geologic Time, An Image Gallery

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An amphipod within Arctic sea ice.
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Amphipod Under Arctic Sea Ice

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Dr. Stephen Cairns, a Smithsonian research zoologist, studies deep-water corals.
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Dr. Stephen Cairns

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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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This new species of lobster (Dinochelus ausubeli) is blind and has bizarre claws. It was discovered about 300 meters (984 feet) deep in the Philippine Sea by a Census of Marine Life expedition.
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Deep Ocean Diversity Slideshow

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A large, white jellyfish floats through murky water
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Ghosts of the Ocean: Explaining Marine Life Devoid of Color

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Two baby olive ridley sea turtles.
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Surveying Life On Sea Turtles

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A 3-D reconstruction of the skull of a fin whale fetus.
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Keeping An Ear Out For Whale Evolution

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Sea lions generate thrust, or forward propulsion, by bringing their fore-flippers together in big sweeping motions called “claps.”  When a sea lion “claps,” it stretches its flippers out to the sides and sweeps them down. Then it tucks its flippe
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How Do Sea Lions Swim?

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