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a man with a hard helmet in a cave
Article

Adaptation in the Extremes: What Scale Worms Teach Us About Evolution

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A woman standing in front of a barge
Article

Mary Rice: A Force of Nature

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Two nurse sharks hover over a baited cage
Lesson Plan

Jelly Critters: Gelatinous zooplankton

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A screenshot from the video showing a fiddler crab with a large claw.
Video

Claws Out: Fiddler Crabs Do Battle

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two polychaete worms side by side
Photo

Pettibone's Polychaete

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This male dancing fiddler crab (Uca terpsichores) has built a sand “hood” at the entrance to his burrow, which he hopes will attract females to his humble abode—as if that big beautiful claw of his weren't enough!
Article

The Design of a Beautiful Weapon

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This jellyfish fossil is from the Cambrian period, more than 500 million years ago.
Photo

Fossil Jellyfish

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The ribbon worm seen here, Ramphogordius sanguineus, is known to regenerate after losing a part of its body.
Article

Ribbon Worm Redux

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Illustration of colorful nudibranchs from Ernst Haeckel.
Article

Art Forms in Nature: Marine Species From Ernst Haeckel

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A tiny larval (baby) starfish.
Article

The Invisible Loss: The Impacts of Oil You Do Not See

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Two octopuses sitting underwater highlight the different textures the animals can take on.
Overview

Octopuses and Squids

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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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