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Sharks are much older than dinosaurs. Their ancestry dates back more than 400 million years, and they are one of evolution’s greatest success stories. These animals are uniquely adapted to their ocean environment with...
Dr. Mahmood Shivji explains how shark DNA is used as evidence to prosecute...
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Sharks are one of nature’s most beautiful—and misunderstood—creatures. When...
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Long before great white sharks appeared, much larger ancestors roamed the ocean...

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“This shark was cruising low along the reef known as Alcyone. Her left eye was glancing up toward other hammerheads when I took this shot from below.” -- Nature's Best photographer, Alan Studley. See more beautiful ocean photos...
The sea's largest fish has been a mystery until recent decades. Thanks to...
An X-ray image of a Monterey skate ( Raja montereyensis ) reveals a spine...

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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...
Reef sharks rarely get any love. These sharks, comprising several species, loiter around coral reefs, snacking on small fish, squids and crustaceans. And while their size is nothing to smirk at—5-10...
Enric Sala has spent much of his career looking for the ocean's "time machines" -- areas rich in biodiversity and largely unaffected by humans. In this recorded webcast , Sala, a National Geographic...
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,...
Starting this Sunday, August 1st, the fins will be circling on a television near you. Sunday kicks off The Discovery Channel’s “Shark Week,” an annual TV ritual that offers hours of programming about...
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...
Imagine an adult person – now triple that size. That’s the size of the great white shark ( Carcharodon carcharias ). The biggest great white sharks can reach up to 20 feet long, but most are smaller...
A life-sized model suspended over visitors at the San Diego Natural History Museum shows what an ancient shark, the Giant Megatooth ( Carcharodon megalodon ), might have looked like. More about the...
Scientists in the Division of Fishes at the Smithsonian's National Museum of Natural History use X-ray imaging to study the complex bone structure and diversity of fish. This image gallery showcases...
What would happen if we let our fear of sharks lead people to kill them all? This is the question Joe Hanson asks in this video from PBS Digital Studios. Find out about how the removal of sharks...
Unlike the hammerhead, the oceanic white-tip shark ( Carcharhinus longimanus ) is aggressive towards humans. It has been noted as a danger toward those stranded at sea, and is very powerful during...
What would you do if you came face to face with a shark ? Brian Skerry lives for these moments and is ready with his camera. Here he is seen photographing a large tiger shark on the seafloor near the...
At night this lemon shark ( Negaprion brevirostris ) lurks at the surface, but often during the day they will lie on the ocean bottom. This behavior had been thought to save them energy, but in...
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...
The scalloped hammerhead shark is one of the five species CITES has protected.
A shark nursery of blacktip reef sharks ( Carcharhinus melanopterus ) in a lagoon in the Pacific. Shark nurseries are found mainly in shallow water regions in which the shark pups can grow up while...
Sharks have a long and impressive lineage. Ancient sharks were cruising the ocean 400 million year ago- long before dinosaurs roamed on land. Relatives of the great white like the giant megatooth...
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...
Three bar jacks and a female tiger shark, nearly 4-meters long, swim off the coast of the Bahamas in this image captured by National Geographic photojournalist Brian Skerry. For nearly 30 years,...
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