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National Geographic Explorer Classroom Magazine
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Illustration by Natalya Zahn

Great Hammerhead Sharks

Great hammerhead sharks can grow as long as 18 feet (5.5 meters) and weigh a thousand pounds (450 kilograms)!

Scientists have different ideas about why the sharks have such unusual heads. Some say that the hammer-shaped head helps the sharks swim better. Others say the head improves the sharks' vision.

One shark in this picture (bottom) is wearing a National Geographic Crittercam. Crittercams include video cameras and other information-gathering devices. These can be attached to animals without hurting them. Crittercams help scientists study the animals that wear them.

More About Sharks

Great White Sharks Creature Feature

Shark Surfari Game

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