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Armed and Dangerous: Eat or be Eaten

Related Article: Learn more about fish.

Marine organisms have special adaptations to find food -- and to avoid becoming food themselves.

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How Great White Sharks Work (2:36)

Great white sharks are infamous for attacks on swimmers and surfers. Check out this story of a great white attack in this video, brought to you by the Discovery Channel.

How Bull Sharks Work (4:15)

Bull sharks are incredibly dangerous because they favor the shallows and because they're one of the few species that can adapt to fresh water. Learn more in this video, brought to you by the Discovery Channel.

How Tiger Sharks Work (1:33)

Tiger sharks have a reputation for being man-eaters, but despite the tiger shark's reputation, no human has been attacked in Shark Bay. To learn more about tiger sharks, check out this video, brought to you by the Discovery Channel.

Aqua-Farming with Neptune Industries (14:58)

Watch this video about aqua-farming on HowStuffWorks. Aqua-farming, growing fish to be harvested, is increasingly becoming a vital food source since farmland is becoming sold to real estate companies. See how Neptune Industries works in this video... More »

Barracuda in Slow Motion (0:48)

Watch the incredible speed of the toothy barracuda.

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World of Sharks: White Tip Sharks (2:57)

This clip from Discovery Channel's "World of Sharks" reveals the mysteries of the white tip sharks residing in the waters of Cocos Island.

World of Sharks: Shark Predators (2:00)

This clip from Discovery Channel's "World of Sharks" reveals modern day piracy in action, as shark hunters illegally seek out sharks in the waters of Cocos Island for the lucrative shark fin market.

World of Sharks: Mysteries of the Hammerhead Shark (2:56)

This clip from Discovery Channel's "World of Sharks" gives an inside glimpse of the elusive hammerhead shark.

World of Sharks: Hammerheads Revealed (2:55)

This clip from Discovery Channel's "World of Sharks" offers an in-depth look at the world of hammerhead sharks.

World of Sharks: Cocos Island (1:47)

This clip from Discovery Channel's "World of Sharks" reveals the wonders of Cocos Island. Cocos Island is a natural paradise just off the shore of Costa Rica.

Ultimate Guide to Sharks: Whale Shark (1:13)

Learn more about the mysterious whale shark in this clip from Discovery Channel's "Ultimate Guide to Sharks."

Ultimate Guide to Sharks: Vibrations and Shark Vision (1:34)

This clip from Discovery Channel's "Ultimate Guide to Sharks" examines how sharks use the ocean's vibrations as well as their excellent sense of vision to find their prey.

Ultimate Guide to Sharks: Tagging Sharks (1:19)

In this clip from Discovery Channel's "Ultimate Guide to Sharks," find out how scientists gather information about the habits and lifetstyles of sharks.

Ultimate Guide to Sharks: Sharks in the Shallows (1:32)

This clip from Discovery Channel's "Ultimate Guide to Sharks" explores sharks that reside primarily in shallow waters.

Ultimate Guide to Sharks: Shark Teeth (2:43)

This clip from Discovery Channel's "Ultimate Guide to Sharks" sheds light on a variety of shark teeth.