Scientists first found an almost complete skeleton of an ancient Phoebodus shark.
A three-meter-long eel shark lives 300 million years ago ready to eat young animals when food sources become scarce.
The 300 million-year fossil of a giant shark shows that they are nearly as long as a bus and much larger than today's white sharks.
According to a report on Historical Biology, experts believe that Arizona used to be the home of a community of sharks that is the most diverse of the green planet in the Middle