Fish

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.

By Molly Edmonds

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?

By Molly Edmonds

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.

By Charles W. Bryant

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?

By Charles W. Bryant

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.

By Molly Edmonds

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.

By Molly Edmonds

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.

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?

By Tom Harris