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A bright-green sea slug with a black background.
Audio

Sea Slugs: One Species at a Time

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Riftia tubeworm (Riftia pachyptila) colonies near hot spring.
Article

The Microbes That Keep Hydrothermal Vents Pumping

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A rendering of an underwater marine scene from the Cambrian Period, featuring an arthropod, annelids, and other animals.
Slideshow

A Collection of Cambrian Fossils

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An amphipod within Arctic sea ice.
Photo

Amphipod Under Arctic Sea Ice

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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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Rough periwinkles sit on a bed of barnacles.
Article

Spirals in Time: A Walk at the Seashore

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A rendering of an underwater marine scene from the Cambrian Period, featuring an arthropod, annelids, and other animals.
Photo

Cambrian Period (542 – 488 Million Years Ago)

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A team of scientists explore the Arctic ocean.
Slideshow

Under Arctic Ice

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The Komodo National Park site in Indonesia was inscribed on the World Heritage List in 1991. The site hosts "Komodo dragons" (Varanus komodoensis), a unique species that exists nowhere else in the world and is of great interest to scientists studying evolu
Article

Tunicates—Not So Spineless Invertebrates

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Small red hyperiid.
Slideshow

The Hyper Eyes of Hyperiids: How Some Shrimp-Like Creatures See Light in the Deep Sea

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Photograph of the underside of a gelatinous octopus with a bright yellow bioluminescent ring around her mouth.
Slideshow

Bioluminescent Animals Photo Gallery

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