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An arrow-worm from the genus Spadella. Alvariño discovered and classified the species Spadella gaetanoi in 1978.
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Ángeles Alvariño: Woman of Many Namesakes

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Sea otters floating on the surface of the ocean.
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Not Just Another Fuzzy Face

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A glowing ocean surface.
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Six Ways to See Ocean Ocean Bioluminescence

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Japanese scientists videotaped this female giant squid, alive, at the water's surface
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Giant Squid

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The Cook islands banknote
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Sharks and Humans: A Love-Hate Story

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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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An oil drilling platform in oil-free water two years after the Deepwater Horizon oil spill in the Gulf of Mexico.
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Gulf Oil Spill

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Satellite view of Earth.
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Earth Day, Spawned from the Sea

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two humpback whales swim underwater
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Whales and Dolphins

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In 2011, storms and lack of ice-cover due to a warmer winter climate resulted in hundreds of seal pups being washed up on the shore of Prince Edward Island. Like many, this young seal faced an uncertain future. See more Nature's Best Photos.
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Ice-Loving Seals and the Loss of Sea Ice

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A ribbon worm curled up in a mud flat.
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The Search for an Elusive Ribbon Worm

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Ari Friedlaender, a research scientist at the Duke University Marine Lab, tags a blue whale.
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Acrobatic Blue Whales Do the Twist While Feeding

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