The earth has gone through many cycles of extinction, but these eight candidates may be extinct creatures that are actually still alive.

A newly discovered dolphin species from 22 million years ago shows evidence of early echolocation, akin to modern dolphins' ...

These animals can also be hard to find in the wild ... In fact, tapirs have a long, proud history in the fossil record, having first evolved in the Miocene epoch, as late as 23 million years ago. They ...