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Valentinni's sharpnose puffer lives on Indo-Pacific coral reefs, where it shoals in groups of 10-100 puffers and feeds on algae and tunicates.
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Valentinni's Sharpnose Puffer

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This fish is using counterillumination to disappear. At left it stands out against the light above it. At right, with bioluminescent structures lit, it blends in.
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Fish Using Counterillumination

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The fringed baleen plates are easy to observe as this North Atlantic right whale skims the water’s surface while it feeds.
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Baleen in Action

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The Japanese spider crab may be big but it is not invincible.
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Japanese Spider Crab

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This tentacle belongs to a blue button. While it has a central “float” with streaming tentacles like typical jellyfish, the blue button is a colony of many small hydroid animals.
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Blue Button Tentacle

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Ancient sea cow vertebra found in the Gatun Formation in Central America, Panama
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Ancient Sea Cow Vertebra

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The Wadden Sea site in Germany and the Netherlands was inscribed on the World Heritage List in 2009. It hosts marine mammals, including the harbor seal Phoca vitulina, pictured here.
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Wadden Sea, Germany & the Netherlands

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This Japanese research ship drills into the ocean floor to learn about Earth’s history and structure.
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Deep Sea Drilling Vessel Chikyu

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A tusk shell hermit crab peeks out of his shell.
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Tusk Shell Hermit Crab

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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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“It’s quite normal for this type of goby to sit still on hard coral like this. I spotted the first of these very small fish and set up my camera for the shot. Just as I was about to take a picture, a second goby came out of nowhere and sat on the first
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Gobies on Coral, Near Marsa Alam, Egypt

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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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