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Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
Slideshow

Zooxanthellae and Coral Bleaching

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Horizontal bands of color represent different species of lichen that have adapted to the conditions at different heights above sea level.
Article

Seaside Lichens

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A bright-green sea slug with a black background.
Audio

Sea Slugs: One Species at a Time

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Relatively slow moving, juvenile plane-head filefish Monacanthus hispidus (Monacanthidae) travel along with the algae. They pick off and eat small animals as they move around in the rotating sargassum ball. Adult filefish only grow to be about 11
Article

A World Adrift: Life in the Sargassum

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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.
Photo

What Is Coral? A Coral Polyp and Zooxanthellae

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Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
Photo

Close-up of a Coral Polyp

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