(Last Updated On: June 12, 2023) NATIONAL MEGALODON DAY | JUNE 15 On the 15th of June, National Megalodon Day teaches us about the most massive shark that ever lived! #NationalMegalodonDay The Megalodon swam the Earth’s oceans for 20 million years during the Cenozoic Era. Their mouths spanned 8 to 11 feet wide and were filled with rows of sharp teeth. With a bite force of over 40,000 pounds per square inch, a maximum weight of over 60 tons, and serrated teeth measuring near 7 inches, their prey did not stand a chance. Megalodon’s dentition consisted of 276 serrated teeth....