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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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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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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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Sea star in a tide pool
Photo

Tide Pools and Adaptations

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A Caribbean hermit crab (Coenobita clypeatus) crawls on the forest floor.
Article

The Great Hermit Crab Migration

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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.
Photo

Sea Stars and Urchins off Antarctica

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On Moorea, an island in French Polynesia, researchers are striving to complete a biocode—a DNA catalog of every life form big enough to pick up with tweezers.
Overview

Scientists Catalog Life on the Island of Moorea

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