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Diagram of narwhal anatomy and tusk function
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Narwhal Anatomy

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A screenshot from the video showing a fiddler crab with a large claw.
Video

Claws Out: Fiddler Crabs Do Battle

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A screenshot from the video showing a Palauan primitive cave eel.
Video

Video of the Palauan primitive cave eel (Protanguilla palau)

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A photo of a swimming Protanguilla palau, the newly discovered genus and species of eel
Article

Scientists Call New Eel Species A Living Fossil

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Charles Darwin's first diagram of an evolutionary tree appears in his First Notebook on Transmutation of Species (1837).
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Darwin’s Evolutionary Tree Diagram

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A bright-green sea slug with a black background.
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Sea Slugs: One Species at a Time

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An Illustration of small tentacled fossils.
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Ancient Entoproct Community

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

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A narwhal breaches the surface, its tusk pointed to the sky
Article

Why a Tusk? The real-life unicorns of the sea and the tusks that make them famous

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Photograph of a transparent polka-dotted squid in the dark ocean.
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Cockatoo Squid

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The first known filter feeder is a large shrimp-like creature called Tamisiocaris borealis. The feather-like structures on its head were used to rake plankton from the sea.
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The First Filter Feeder

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