Shark
From the Simple English Wikipedia, the free encyclopedia that anyone can change
Sharks are a group of fish with skeletons made of cartilage instead of bone. There are more than 350 different kinds of shark. Fossils have shown that sharks have been around for between 455 to 425 million years[1].
Most sharks are predators, meaning they hunt and eat fish and other sea creatures, but some of the largest sharks eat krill. The largest shark is the whale shark, and it is the largest fish in the world. Some common kinds of shark include the hammerhead shark, the great white shark, the tiger shark, and the mako.
Many sharks are now endangered, but some are still hunted for food (like shark fin soup) or sport fishing.
[change] Characteristics
Sharks come in many different shapes and sizes, but most are long and thin, with powerful jaws. Their teeth are constantly replaced. New teeth grow continuously in a groove just inside the mouth and move forward from inside the mouth on "conveyor belts" formed by the skin in which they are attached to.
[change] Senses
Most sharks have a very good sense of smell, which they use to find prey. They are also very good at feeling vibrations in the water.
[change] References
- ↑ Elasmo-research.org - Biology of Sharks and Rays
