Many sharks actively chase their food. Only 25 kinds of sharks eat big fish and mammals. These eat sea mammals and even other sharks. Sharks have 5 to 20 rows of teeth. They loose worn out teeth about every 8 days.
Some new ones grow in.
The shark moves its jaw from side to side to chew. This motion helps move the food to the back of its mouth where it can be swallowed whole. Sharks have a good sense of smell. They have excellent vision and good hearing. Sharks can also feel vibrations in the water made by other fish.