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The blue lined octopus can be deadly, so it is best to stay away.
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The Dangerous Blue Octopus

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A small giant clam -- yes, that's it's real name -- in Australia's Great Barrier Reef.
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Great Barrier Reef, Australia

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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.
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Hermit Crab Without a Shell

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Sea otters floating on the surface of the ocean.
Article

Not Just Another Fuzzy Face

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A blue-ringed octopus
Article

How Octopuses and Squids Change Color

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A translucent hyperiid on a black background with orange stripes along its head.
Article

Many Eyes, Many Perspectives: The Astonishing Visual Systems of Hyperiids

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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 siphonophores are an order of marine animals in the phylum Cnidaria (the same phylum containing jellyfish). 
Slideshow

Prints from Ernst Haeckel

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Chrysaora melanaster is a jellyfish found in the Arctic.
Overview

Jellyfish and Comb Jellies

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A polar bear and its cub in Arctic National Wildlife Refuge, Alaska.
Slideshow

Celebrating Marine Moms

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Japanese scientists videotaped this female giant squid, alive, at the water's surface
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Giant Squid

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Colorful fishes throng a reef in the Northwestern Hawaiian Islands.
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Bizarre and Beautiful Coral Reef Animals

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