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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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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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The Galapagos Islands site in Ecuador was inscribed on the World Heritage List in 1978. Located in the equatorial Pacific Ocean nearly 1000 km from South America, the Galapagos Islands and the surrounding marine reserve are a unique "living museum and show
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Sally Lightfood Crab, Galápagos Islands, Ecuador

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Great White Shark at sea surface – marvels of evolution.
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Great White Shark at Surface

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A chart showing the evolution of cephalopods through geologic time.
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Tracking Cephalopods Through Time

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two polychaete worms side by side
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Pettibone's Polychaete

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Walter Adey and the NMNH coral reef tank
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Walter Adey and Coral Reef Tank

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A close-up image of a fossil shark jaw with teeth.
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Teeth and Jaw of an Ancient Shark

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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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Sea squire illustrations from Ernst Haeckel.
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Sea Squirts

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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 Archean Eon (4,600 – 2,500 Million Years Ago)

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This jellyfish fossil is from the Cambrian period, more than 500 million years ago.
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Fossil Jellyfish

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