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A narwhal breaches the surface, its tusk pointed to the sky
Article

Why a Tusk? The real-life unicorns of the sea and the tusks that make them famous

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Like other cephalopods, the common cuttlefish (Sepia officials Linnaeus, 1758) possesses serious brain power.
Article

So You Think You're Smarter Than a Cephalopod?

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Giant Pacific Manta Ray, Roca Partida Sea Mount, Revillagigedos Islands, Mexico
Article

Tagging and Tracking Animals Underwater

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Hundreds of illustrated red crabs gathering on sand with Santa hats.
Article

Here Comes Santa Claws

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A school of bluefin tuna
Article

The Great Pacific Migration of Bluefin Tuna

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A female (top left) and male Photerus annecohenae. Note that females are larger than males (sexual dimorphism) and that males have bigger eyes.
Article

You Light Up My World!

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A blue parrotfish hides among coral.
Article

Tough Teeth and Parrotfish Poop

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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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Screenshot from the "Masters of Disguise" video showing a spotted octopus on the seafloor.
Video

Masters of Disguise

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Thumbnail of a cartoonish octopus.
Video

Why the Octopus Brain is so Extraordinary

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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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A blue-ringed octopus
Article

How Octopuses and Squids Change Color

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