Coelacanth: Meg Ryan

When T. rex roamed prehistoric Earth, coelacanth swam in its ancient seas. Fossil evidence convinced paleontologists the fish suffered extinction roughly 65 million years ago. Facts shifted when fishermen netted a coelacanth off the coast of Madagascar in 1938. Further study revealed several breeding colonies thrive today in the Indian Ocean, proving a cryptozoological axom: just because you don't see it, doesn't mean it isn't there.