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What is coral? The answer is coral is an animal. This cutaway diagram of a coral polyp shows the location of its photosynthetic algae, or zooxanthellae, which coral needs to survive.
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What Is Coral? A Coral Polyp and Zooxanthellae

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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 rendering of an underwater marine scene from the Cambrian Period, featuring an arthropod, annelids, and other animals.
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Cambrian Period (542 – 488 Million Years Ago)

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Illustration of a four-legged proto-whale with webbed feet.
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Early Whale with Webbed Feet

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This whale is entangled in fishing gear. The inset shows how special fishing lines allow whales to escape such accidental entrapments.
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Fishing Gear Solutions

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Phoenix’s entanglement badly injured her right lip, leaving a distinctive scar from that ordeal.
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Beware of Fishing Gear

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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.
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Carbonate Reef (Cretaceous Period: 145 - 65 Million Years Ago)

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a single celled organism
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Tiny Ciliate

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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.
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Cameraman with Sea Nettles

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Two ARMS sit on the ocean floor.
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Picture of ARMS in Papua New Guinea

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About a 300 foot long gill net found abandoned on a shallow reef in the surf zone on Oahu, Hawaii. The net had trapped parrotfish, wrasses, goatfish, surgeonfish, coral crabs, spiny lobsters, slipper lobsters and other fish that had decayed beyond identifi
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Discarded Gillnet Traps Fish

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The Belize Barrier Reef Reserve System consists of the largest barrier reef in the northern hemisphere, offshore atolls, and several hundred sand cays, mangrove forests, coastal lagoons, and estuaries. The system's seven sites illustrate the evolutionary h
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Belize Barrier Reef Reserve System

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