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painting of squid pulling sailor underwater
Video

Clyde Roper On the Over-Sized Anatomy of the Giant Squid

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Thumbnail of a cartoonish octopus.
Video

Why the Octopus Brain is so Extraordinary

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X-ray image of a winghead shark
Slideshow

X-Rays of Fish Reveal Diversity

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Tropical hatchetfish, like the one shown in this X-ray photograph, live in the dark depths of the ocean. Like many other deep-sea fishes, they have large eyes and bioluminescent spots on their bellies.
Photo

X-Ray Image of a Tropical Hatchetfish

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In the X-ray image of this Viper Moray Eel (Enchelynassa canina), note the second set of jaws in the “throat”; these are the gill arches, which are present in all fish.
Photo

X-Ray Image of a Viper Moray Eel

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Dover Sole Skin
Photo

Close-Up of Dover Sole Skin

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Beating Cilia of Comb Jelly Combs
Photo

Sea Gooseberry Larva

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Tiny sponge spicules.
Photo

Sparkling Sponge Spicules

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A close-up of tiny teeth on the common whelk's radula.
Photo

A Snail's Rainbow Radula

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A right whale opens wide, revealing huge plates of baleen hanging from its upper jaw.
Photo

Right Whale Baleen

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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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Sea lions generate thrust, or forward propulsion, by bringing their fore-flippers together in big sweeping motions called “claps.”  When a sea lion “claps,” it stretches its flippers out to the sides and sweeps them down. Then it tucks its flippe
Article

How Do Sea Lions Swim?

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