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This purple urchin Paleopneustes cristatus is seldom seen by itself, and can be found in groups of hundreds.
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Purple Sea Urchin

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A screenshot from the video showing a giant barrel sponge.
Video

What Makes Sponges Grow?

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

Acanthaster planci

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Tiny sponge spicules.
Photo

Sparkling Sponge Spicules

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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
Photo

Can You Spot the Seahorse?

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A coral has just spawned. Each of the hundreds of polyps releases a small pink bundle of sperm and eggs.
Article

A Tale of Sex and Stress in the Ocean

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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 couple inches wide and up to ten feet long, the bobbit worm stays hidden under tropical sands with just its five antennae poking out—waiting for prey to swim by.
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The Bobbit Worm

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