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  Sharks
Sharks are deadly predators in the wild, but we are a bigger threat to them than they are to us
1/7 Sharks are deadly predators in the wild, but we are a bigger threat to them than they are to us
Sharks are attracted to swimmers by the electricity they generate
2/7 Sharks are attracted to swimmers by the electricity they generate
Sharks can pick up sounds from more than a mile away and can detect electricity down to just five billionths  of a volt
3/7 Sharks can pick up sounds from more than a mile away and can detect electricity down to just five billionths of a volt
Thanks to the film Jaws, the Great White shark is the most infamous type of shark - they can grow up to 6m
4/7 Thanks to the film Jaws, the Great White shark is the most infamous type of shark - they can grow up to 6m
Baby sharks are laid in these egg cases, you can just see the tiny sharks inside
5/7 Baby sharks are laid in these egg cases, you can just see the tiny sharks inside
There are about 450 species of sharks in the world. They first appeared 400 million years ago, that's before reptiles
6/7 There are about 450 species of sharks in the world. They first appeared 400 million years ago, that's before reptiles!
Sharks continually lose their teeth, but lost teeth are replaced by teeth growing in behind the front row
7/7 Sharks continually lose their teeth, but lost teeth are replaced by teeth growing in behind the front row

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