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A nudibranch showing a closeup of their fleshy, tentacle-like growths, called cerata.
Article

How Sea Slugs Steal the Defenses of Their Prey

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Two of the worlds largest jellyfish, the lions mane jellyfish, float together.
Photo

Extreme Jellyfish

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Two clams, a mussel, an oyster, on a bed of algae
Article

Shellfish for Dinner: More than just Clams and Oysters

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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.
Overview

Sea Stars, Urchins, and Relatives

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This day octopus (Octopus cyanea) has shaped itself like seagrass or some coral so hide from predators or stalk prey.
Photo

Camouflaged Octopus Blends In

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A tan sea urchin from the deep seas of Curacao.
Photo

Tan Sea Urchin

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Hermit crabs, like this one collected in Moorea, usually protect their soft, vulnerable abdomens from predators by reusing empty snail shells. This specimen shows the crab without its customary borrowed shelter.
Photo

Hermit Crab Without a Shell

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Overfishing is leading to an abundance of less desirable species like jellyfish.
Article

Peanut Butter and Jellyfish

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a squid
Article

Meet the Only Squid that Willfully Lops off its Arms

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an orange sea star a top seaweed
Photo

The Ochre Star

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A blue-ringed octopus
Article

How Octopuses and Squids Change Color

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

What Makes Sponges Grow?

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