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Giant squid have eight arms but use their two long feeding tentacles to seize prey.
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Giant Squid Anatomy

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The tough serrated ring around the opening grips the squid’s prey.
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Giant Squid Sucker

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Photograph from above of a lavender-colored sea-slug with deep purple markings, swimming above a pink and orange surface.
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Purple Nudibranch

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A tongue-like organ called the radula rams food down the giant squid's throat.
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Giant Squid Beak and Radula

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A mangrove tree crab clings to a leaf near a Smithsonian marine laboratory in Panama.
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Mangrove Tree Crab

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A photo of a solitary European green crab on a sandy substrate.
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European Green Crab (Carcinus maenas)

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Like other cephalopods, the common cuttlefish (Sepia officials Linnaeus, 1758) possesses serious brain power.
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Common cuttlefish

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The elusive giant squid
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Giant Squid Caught Live On Screen

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A deep red jellyfish, Crossota norvegica, floats in the water.
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Deep-Red Jellyfish

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The sea star Odontaster validus and sea urchin Sterechinus neumayeri are often found living in association with one another along the Antarctic coastline, here during the Census of Marine Life.
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Sea Stars and Urchins off Antarctica

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A photo of a solitary European green crab on a sandy substrate.
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A green crab’s super power: eating through its gills

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The Autonomous Reef Monitoring Structure was developed to help scientists study coral reef diversity and have now been adopted broadly to study diversity around the world.
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Uncovering Biodiversity… with ARMS and a Submarine Claw

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