interesting 21 Things You Didn't Know About Sharks  

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List Rules Vote up the most fascinating facts about these sharp-toothed creatures of the deep.

There is so much more to sharks than the popular image of them as cold-blooded, man-eating killing machines. Sure they're some of the most evolved and capable hunters in the animal kingdom, but there are plenty of shark facts that can better our understanding of these creatures and have you captivated by more than just their impressive teeth.

Sharks have been known to curiously investigate humans and other objects in their environment that are strange to them. So indulge your curiosity for facts about sharks. Get to know their evolutionary history and their biology. Learn what makes them so impressive with the shark information collected in the list below!
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Sharks Can Sense You from Your Body's Electricity


Sharks Can Sense You from Your... is listed (or ranked) 1 on the list 21 Things You Didn't Know About Sharks
Photo:  Albert kok/Wikimedia Commons
Sort of. Sharks have an array of electroreceptors in the pores around their mouths. These receptors can detect tiny electromagnetic fields made by things as seemingly inconsequential as muscle contractions or movements in living organisms. In the conductive environment of sea water, sharks have been measured detecting electric fields as weak as 5/1,000,000,000 of a volt per centimeter of receptor tissue.

There is no hiding from a shark - this is almost as conductive as the most high-tech man-made materials.
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Hammerheads Have a 360 Degree View of the World Around Them


Hammerheads Have a 360 Degree ... is listed (or ranked) 2 on the list 21 Things You Didn't Know About Sharks
Photo:  suneko/flickr/CC BY-SA 2.0
One of the most distinctive looking types of sharks, it is believed that the shape of the shark's head and positioning of its eyes is an evolutionary adaptation to give it superior views of its surroundings. Hammerheads have a virtually 360 degree view at all times, letting them efficiently sweep for prey.
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Until the 16th Century They Were Called "Sea Dogs"


Until the 16th Century They We... is listed (or ranked) 3 on the list 21 Things You Didn't Know About Sharks
Photo:  Counselling/Pixabay
Until the 16th century, mariners called sharks "sea dogs." Why? If you squint, a hairless teeth-lined maw with fins and no legs looks kind of like a dog, probably. The etymology of the word "shark" is not quite clear but it may have its origins in the Dutch words for predator or scoundrel.
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There Are Over 500 Species of Sharks


There Are Over 500 Species of ... is listed (or ranked) 4 on the list 21 Things You Didn't Know About Sharks
Photo:  TigrouMeow/Pixabay
They are found in oceans all over the world. They usually inhabit depths up to 2,000 meters below sea level and there are very few fresh water sharks.