Sharks

The 15 Most Surprising Shark Facts

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by: Anastacia Darby

#6 Hammerhead sharks' oddly shaped heads, called cephalofoils, aren't just for show. They are equipped with electrical sensors, which make hammerheads superior hunters.

Hammerhead Shark
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#7 Well this brings new meaning to sibling rivalry. When some shark embryos develop teeth, they eat their unborn siblings until one shark remains. This is known as intrauterine cannibalism.

Shark Mouth
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#8 It's official: a shark dentist would never go out of work (if such a thing existed). Some sharks can cycle through up to 35,000 teeth in their lifetimes.

Shark Teeth
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#9 In many species of sharks the females are larger than the males, but male snaggletooth sharks are twice the size of the females. You can't win 'em all.

Female Shark
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#10 Sharks live in all of the world's oceans. Some species, such as the bull shark, are also able to survive in freshwater environments.

Bull Shark
iStock
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