MEGALODON
Megalodon is probably the best-known creature in the list; it’s hard to keep the idea of a shark the size of a school bus out of pop culture. Plus, science-minded entertainment sources like the Discovery Channel love creatures that could pass for a movie monster. Despite the popular idea that Megalodon coexisted with dinosaurs, they lived from 25 to 1.5 million years ago, meaning that at best they missed the last dinosaur by 40 million years. On the other hand, this meant they might have still been around for the first humans.
Megalodons swam the warm oceans that were around until the last ice age in the early Pleistocene, which may have robbed them of their breeding grounds and food. Sometimes, it seems nature has our back