Sharks

Sharks come in all sizes, from the tiny spined pygmy to the 40-foot whale shark, but the great white is hands-down the most famous, thanks in no small part to a little movie called "Jaws."

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How Hammerhead Sharks Work

Hammerheads have itty-bitty mouths, a tall dorsal fin and an impressively odd noggin. Why do these creatures of the deep look so strange?

How Angel Sharks Work

You probably keep an eye out for that telltale fin swimming toward you when you hit the beach. Did you ever think that there might be sharks on the ocean floor, too?

Why are goblin sharks called that?

The good news is, you're not likely to meet with one of these creatures on your next beach vacation. If you did, it wouldn't be a pretty sight.

Why are cookiecutter sharks called that?

They look harmlessly small for a shark. But their teeth carve bites out of seals, dolphins and even larger sharks. Guess what shape that bite leaves in the victim?

What do most sharks eat?

They range in size from 8 inches to 60 feet, so obviously their food preferences will differ. Sometimes what seems like a good meal, isn't, so they spit it out. That includes humans.

What is electroreception and how do sharks use it?

Ever wonder -- as you're treading water in the ocean -- how a shark might hunt you down? They have a special sense that helps them locate prey.

What causes a shark feeding frenzy?

The lure of a free meal is enough to get most of us moving and maybe even throwing an elbow or two as we battle for the last slice of pizza. Compared to sharks though, our feeding frenzies are tame.

How many sharks are killed recreationally each year -- and why?

Sharks have been around longer than the dinosaurs. After a few hundred million years, it's humans that might kill them off.

How Great White Sharks Work

People are so fascinated with this fierce, fast ocean predator that they've lowered themselves into steel cages to observe it up close. If you read this article though, you won't have to do that.

Could shark cartilage help cure cancer?

Humans kill an estimated 100 million sharks every year. Some of these sharks are harvested for their supposedly cancer-fighting cartilage. Is there any truth to the claim?

How are shark pups born?

You think you and your siblings don't get along? Try being a shark. You might not even make it out of the womb without your brother or sister eating you.

How Nurse Sharks Work

Mellow probably isn't the first word that you think of when it comes to sharks, but these slackers of the sea could change your mind. What's their life of leisure like?

Top 10 Shark Attack Stories

"Jaws" scared movie audiences into staying away from the water. But for some, especially some free-diving abalone hunters, a bloodthirsty shark isn't just a story.

How Bull Sharks Work

Great whites are the flashy man-eaters of the silver screen. But bull sharks may be the most dangerous, with a dinner menu that sometimes consists of sloths, dogs and cows. What can you say? They're opportunists.

Why do people collect shark teeth?

Sharks can have up to 15 rows of teeth growing behind their front row of chompers, so it's no surprise how many shark teeth litter beaches. But why do people collect them?

How do sharks see, smell and hear?

You don't reign supreme over the marine food chain without acute senses that can smell blood or hear injured prey from great distances. And sometimes a "sixth sense" doesn't hurt either.

How Tiger Sharks Work

Have you ever been so hungry that you could eat anything? How about a hubcap? Or maybe a suit of armor? If you said "yes," you might have something in common with the second deadliest shark.

Shark Pictures

Sharks are an intelligent and sometimes dangerous species of saltwater fish. Learn more about these often feared, often misunderstood creatures of the deep in this gallery.

How Sharks Work

The oldest shark fossils date from more than 300 million years ago, before the dinosaurs. A few species have kept the same physical characteristics for more than 150 million years. How have they survived so well?


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