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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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Male fiddler crabs, like this one collected on Moorea, wave their enlarged claw as way of signaling to other crabs, especially during mating season.
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Fiddler Crab

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The fins of the frogfish are perfect for creeping around in the algae and stalking unsuspecting prey.
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Frogfish Histrio histrio

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A photo of a sea toad specimen.
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A Sub and a Sea Toad

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A mosaic of photos from underwater live stream cameras.
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Get Your Ocean Fix From Home

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The whitish spots on this fish are individual parasitic trematode worms.
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Marine Parasites: Crazy…and Really Cool!

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Screenshot from the "Masters of Disguise" video showing a spotted octopus on the seafloor.
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Masters of Disguise

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A Caribbean hermit crab (Coenobita clypeatus) crawls on the forest floor.
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The Great Hermit Crab Migration

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In the X-ray image of this Viper Moray Eel (Enchelynassa canina), note the second set of jaws in the “throat”; these are the gill arches, which are present in all fish.
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X-Ray Image of a Viper Moray Eel

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A formal signing of a memo of understanding
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NOAA and NMNH Sign Memo of Understanding

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