The Mighty Megalodon
Source: https://cdn.historydaily.org/
If there was a gigantic prehistoric crocodile, there was also the humongous prehistoric shark known as the Megalodon. These days, the biggest shark recorded so far was a 20-foot 8-inch great white nicknamed Deep Blue, but back when dinosaurs were still alive, the Megalodon was said to be at least 60-feet long, four times the ones still swimming in our oceans now, as demonstrated in the photo above.