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Tiny Ciliate

This Blepharisma japonicum is a single-celled protist called a ciliate, a...

Photo

The Model Megalodon

Take a trip to the National Museum of Natural History in Washington, D.C. and you...

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Cyanobacteria

This blue-green microbe called a cyanobacterium was likely the first photosynthetic...

overview

The Megalodon

Carcharocles megalodon was once the most fearsome predator to reign the seas. This...

slideshow

Sharks from the Vault

The sharks housed in the Smithsonian National Museum of Natural History's...

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Leopard Catsharks

These gorgeous sharks are leopard catsharks (Poroderma pantherinum) found in the...

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A Toothy Grin

The southern African frilled shark (Chlamydoselachus africana) is a very rare shark...

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Cookie Cutter

This cookie-cutter shark (Isistius brasilienses) has a unique bite mark that they...

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A Blind Shark Baby

The blind shark (Brachaelurus waddi) is lecithotrophic viviparous— the eggs are...

Article

What the Megalodon Left Behind

The largest shark ever to exist on this planet, Carcharocles megalodon, could grow...

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A Bull Shark's Toothy Grin

Understanding shark movements and population sizes require scientists to catch...

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Sizing it Up

The Smithsonian Environmental Research Center is studying the movements of sharks...