Prehistoric giant shark discovered 290 million years ago in

A New Species Of Massive Prehistoric Shark Has Been Discovered

How fussy eating and changing environments led to the diversity of sharks today (and spelled the end for megalodon)

Pictures and Profiles of Prehistoric Sharks

Could Megalodon attack and kill a whale shark? - Quora

Prehistoric 91-million-year-old Shark Discovered in Kansas Was Size of a Great White and Had Cannibal Babies

Shark species - The Australian Museum

What did megalodon really look like? Is it like a giant great white shark? - Quora

Tooth analysis confirms the megalodon - a huge ancient shark - was warm-blooded

History of Sharks: Earliest Ones. Dinosaur-Era Ones and Megalodon

For the Belt and Road--Seetao

Megalodon, Size, Fossil, Teeth, & Facts

Scientists discover 439 million-year-old 'shark' species

Helicoprion by Judy Tomas on Prezi