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A photo of zebra mussels clinging together, the mollusks have successfully invaded brackish and freshwater areas across North America.
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Zebra Mussels (Dreissena polymorpha)

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A shortfin mako glides through the waters off the coast of California.
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Shortfin Mako Shark

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A blue shark, with a copepod attached to its dorsal fin, coasts through waters near New England.
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Blue Shark

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An oceanic whitetip shark swims near a biologist in the Bahamas.
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Oceanic Whitetip Shark

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A point made of Ramah Chert that belonged to the early Eskimo group known as the Groswater Dorset Smithsonian Arctic Studies Center
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Early Eskimo Point

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A fragment of European ballamine ceramic that was excavated at Hare Harbor in Quebec, Canada in 2011
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Fragment of a European Bellarmine Jug

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A male surfer catching a wave in Hawaii
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Inside the Wave, Makena Beach, Maui

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Head shot of Dr. Nancy Rabalais of the Louisiana Universities Marine Consortium.
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Lecture: "Troubled Waters in the Gulf of Mexico"

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Purple, pink and green corals growing underwater on a metal fence-like substrate.
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The Coral Gardener

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A veined octopus sits inside a vacant bivalve shell, which it uses as a portable shelter, in the Philippines. This is one of the few examples—if not the only example—of tool use in invertebrates.
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Veined Octopus at Anilao Batangas Pier, Philippines

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“Upon returning from the reef after a night dive, I swam toward a bright reflection and came eye-to-eye with this beautiful, curious squid.” -- Nature's Best photographer Charles Viggers.Equipment Used to Capture the Shot: Nikon D700; 105mm ƒ/2.8 lens
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Squid at Sunset Reef Grand Cayman, Cayman Islands

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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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