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Squid expert Dr. Clyde Roper examines specimens stored in jars in the Smithsonian collection.
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Dr. Clyde Roper

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A cameraman navigates a smack of sea nettles (Chrysaora fuscescens) in Monterey Bay. Sea nettle blooms have become more common in recent years.
Photo

Cameraman with Sea Nettles

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Illustration of a giant squid versus a merman.
Slideshow

From Mermen to Architeuthis, Our Fascination with the Giant Squid

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A rendering of an underwater marine scene depicting life ~145-65 million years ago, when rudist clams were the major reef builders.
Article

Long Before Coral, Mollusks Built the Ocean's Reefs

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A photo of a squid using bioluminescence to hide in the deep sea.
Overview

Bioluminescence

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This species of bamboo coral, discovered in 2004 in the Pacific Northwest, has unusually long and impressive tentacles.
Slideshow

Newly Discovered Deep-Sea Corals

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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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A cuttlefish eye
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Dazzling Eyes

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Blue Dragon nudibranchs are very common to the southeast coast of Australia and have a few color variations. Juveniles are white with blue rhinophores, and adults vary from dark purple to lavender to golden brown.
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Serpent Pteraeolidia

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Two nurse sharks hover over a baited cage
Lesson Plan

Head to Foot

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squid missing arm tip
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Squid Missing Arm

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Around 44 million red crabs (Gecarcoidea natalis) are endemic to Christmas Island located in the Indian Ocean.
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The Red Crab of Christmas Island

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