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Sharks come in all sizes. The largest is the whale shark , which has been known to get as large as 18 meters (60 feet). The smallest fits in your hand. And the great...
For the last 150 years, paleontologists have debated the origins of the great...
The smallest shark, a dwarf lantern shark ( Etmopterus perryi ) is smaller than...
What is scarier: sharks or extinction? This video from Save Our Seas puts...

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Sharks have young in three different ways. After internal fertilization, some species lay a thick egg case that encloses the shark embryo (seen in the photo here). Most species are ovoviviparous, which means that the shark...
This fossil tooth whorl of the ancient shark Helicoprion , dates back 290...
A male great hammerhead shark swims in the Bahamas at sunset. Scientists...

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There are more than 500 species of sharks swimming in the world’s ocean. Yet when most people think of these cartilaginous...
A scientific illustration of the most powerful fish of its time, Carcharodon megalodon , which swam the ocean 30 million years ago. This shark may have reached a size of 20 meters/66 feet. Meet other...
by Caty Fairclough Sharks have been feared hunters ever since people first observed them swimming in the vast ocean. Yet today, sharks are declining rapidly on a global scale because humans have...
By-catch, illegal fishing, sport fishing, loss of prey and habitat and shark nets are threatening Great White Shark ( Carcharodon carcharias ) populations globally. More about the great white shark...
How does this skate ( Bathyraja richardsoni ) measure up? Researchers use underwater equipment to estimate its size. The marks on the meter-long scale bars are 10 cm apart. The yellow ribbons show...
A male great hammerhead shark swims in the Bahamas at sunset. Scientists debate the purpose behind these sharks' hammer-shaped heads. A commonly accepted theory is that the shape allows the shark to...
The shortfin mako shark ( Isurus oxyrinchus) is found offshore in tropical and warm temperate waters of all oceans, but has been known to travel to cooler waters at times. It is very strong and the...
An array of teeth from the sand tiger shark Carcharias taurus . The Smithsonian has the largest collection of shark teeth in the world, with more than 90,000 fossil shark teeth. More about sharks and...
This illustration shows one old idea of what the ancient shark Helicoprion might have looked like. There once was room for many ideas—some more plausible than others—because the only fossils of the...
Imagine that you're a shark swimming beneath the surface, minding your own business, when—smack!—you swim right into a net. Entangled, you are unable to keep swimming forward to draw water over your...
Great White Sharks breach to hunt -- with split-second timing they grab an unsuspecting seal or sea lion in one swift snatch. Follow the action in this slideshow of a breaching sequence .
Great White Sharks breach to hunt -- with split-second timing they grab an unsuspecting seal or sea lion in one swift snatch. Follow the action in this slideshow . More about the great white shark...
Ever heard of a cookie-cutter shark ( Isistius brasiliensis )? They look like your average shark —sort of menacing and streamlined—but their name comes from how they feed. They eat smaller animals (...
"Tens of millions of sharks are killed each year, often only for their fins. I have wrestled with how to take pictures of dead sharks that resonate with readers. One morning, I jumped into the sea in...
Dr. Mahmood Shivji of the Guy Harvey Research Institute and Save Our Seas Shark Center sampling a confiscated shark fin for DNA analysis. He can determine the species for hundreds of shark fins using...
A thresher shark’s long tail fin helps not only its swimming ability, but also its ability to hunt. It can use the fin to herd and trap schooling fish by swimming in increasingly smaller circles...
Come play in South Africa’s False Bay, where wild creatures roam. Print out this board game to play at home or school.
Sharks are one of nature’s most beautiful—and misunderstood—creatures. When most people think of sharks, they think of unexpecting swimmers being attacked and eaten by a nightmarish creature. But...
CREDIT: © Mary Parrish/Smithsonian Institution 1. Respect Your Elders Sharks have a long and impressive lineage. Ancient sharks were cruising the ocean 400 million years ago—long before dinosaurs...
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