When a shark's tooth falls out they grow a new one. They have an endless number of teeth. A shark will grow its tooth back if the tooth is broken or falls out. A shark could go through a thousand teeth in its life time
A shark's jaw is loaded with teeth.
Sharks can have from five to seven gills. The six gilled shark contains the substance called "tape turn". This is the same substance that makes a cat’s eye green. The six gilled shark needs this substance to see in dark, deep water.
A dolphin will attack a shark to protect its young.
Dolphins usually kill sharks.
If you rub against a shark, you may bleed because their skin is like sharp teeth.
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