Top 3 Prehistoric Sharks

Sharks are a very old group of animals, and they've had millions of years to evolve. This has led to some very scary creatures throughout their history, including the famous Megalodon, the biggest shark of all time.

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Sources:
https://www.wired.com/2011/03/unravel...
https://en.wikipedia.org/wiki/Helicop...
http://paleobiology.si.edu/helicoprion/
https://en.wikipedia.org/wiki/Stethac...
http://www.bbc.co.uk/science/seamonst...
http://www.prehistoric-wildlife.com/s...
http://www.prehistoric-wildlife.com/s...
http://www.bio-nica.info/Biblioteca/W...