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The pink strands of this coral harbor a variety of organisms. Sea whips are gorgonian corals, with flexible skeletons.
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Sea Whip Coral

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a skeleton of a button coral that looks like a snow flake
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Button Coral

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A submersible explores the deep reefs off of Curacao in the Caribbean.
Overview

DROP: The Deep Reef Observation Project

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A soft, yellow coral
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Soft Coral

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Grey reef sharks are among the most versatile and tough predators on a Pacific coral reef, but they are also among the most vulnerable species, as they are threatened by wasteful fishing practices like shark finning.
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Grey Reef Shark in the Line Islands

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A crown-of-thorns starfish in the Marianas Islands.
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Mystery Photo: Prickly Puzzler on the Reef

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Two nurse sharks hover over a baited cage
Lesson Plan

Connected Ecosystems

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Photo of coral polyp, with a single bleach polyp.
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Corals Threatened by Acid Seas

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Shown here are several deep-sea coral species: From left to right are an unidentified purple octocoral, a small gold acanthorgorgiid octocoral, and a large colony of pink Corallium secundum
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Diverse Deep-Sea Corals

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UV light illuminates growth rings in a cross-section of 44-year-old Primnoa resedaformis coral found about 400 m (1,312 ft) deep off Newfoundland.
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Coral Growth Rings

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: Black corals often resemble bushes or trees. Their living tissue can be one of several colors. It’s the skeleton that is black.
Article

Black Corals of the Deep

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Tree corals like this Calyptrophora bayer can grow several meters high and resemble brightly colored trees.
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Red Tree Coral

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