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

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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 photo of zebra mussels clinging together, the mollusks have successfully invaded brackish and freshwater areas across North America.
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Zebra Mussels (Dreissena polymorpha)

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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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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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A 3-D reconstruction of the skull of a fin whale fetus.
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3-D Reconstruction Of Fin Whale Skull

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This 1890 painting of Charles Darwin is on display at the Turin Museum of Human Anatomy.
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Charles Darwin

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X-ray image of a longnose butterflyfish
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X-Ray Image of a Longnose Butterflyfish

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