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The fringe of a white Christmas tree worm.
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White Christmas Tree Worm

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Photograph of a bristly brown and white worm, with one end pressed against a pale green coral.
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Fireworm Takes on Fire Coral

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Colorful Christmas tree worms
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A Forest of Christmas Tree Worms

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A zoomed-in image of the crown-of-thorns sea star.
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Acanthaster planci

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Orangutan crabs are covered in thin reddish hairs, and are frequently found living in bubble coral.
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Orangutan Crabs from Komodo Island

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It's a pygmy seahorse (Hippocampus bargibanti), found in Indonesia's biodiverse Coral Triangle and one of the smallest seahorse species in the world! They can change colors like a chameleon to blend into their environment. This helps to protect them from p
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Can You Spot the Seahorse?

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Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
Overview

Corals and Coral Reefs

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A zoomed-in image of the crown-of-thorns sea star.
Article

A Plague of Sea Stars

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Colorful fishes throng a reef in the Northwestern Hawaiian Islands.
Slideshow

Bizarre and Beautiful Coral Reef Animals

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A brittle star clings to the branches of a deep sea coral
Article

A Brittle Star May Be a Coral’s Best Friend

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Gerardia, or gold coral, species often have a tree-like shape, as evident in this specimen.
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Gold Coral

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A fan-shaped colony of red coral (Corallium sp.) provides a perch for three basket stars as they feed.
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Red Coral

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