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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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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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A narwhal breaches the surface, its tusk pointed to the sky
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Why a Tusk? The real-life unicorns of the sea and the tusks that make them famous

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Like other cephalopods, the common cuttlefish (Sepia officials Linnaeus, 1758) possesses serious brain power.
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So You Think You're Smarter Than a Cephalopod?

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Extreme close-up of great white shark skin denticles.
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Biomimicry Shark Denticles

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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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Diagram of narwhal anatomy and tusk function
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Narwhal Anatomy

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Kelps are large, brown algae that grow along coasts around the world, especially in cooler regions.
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With Every Breath You Take, Thank the Ocean

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This male dancing fiddler crab (Uca terpsichores) has built a sand “hood” at the entrance to his burrow, which he hopes will attract females to his humble abode—as if that big beautiful claw of his weren't enough!
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The Design of a Beautiful Weapon

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An adult and juvenile killer whale frolic in the water.
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Menopausal Moms: A Mammal Mystery

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This 1874 illustration of California gray whales (Eschrichtius robustus) shows a group of individuals at the edge of their modern day range in the North Pacific Ocean, blocked from traveling further east into Arctic waters by thick ice barriers.
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In the Arctic, the Times, They Are a-Changin: You Can Pitch in to Understand How

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A woman standing in front of a barge
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Mary Rice: A Force of Nature

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