Over the course of Earth's history, more than 99.9 percent of all species that have ever existed have become extinct. It is estimated that up to 50 billion species that once roamed our globe disappeared from the terrestrial stage some time ago. But is that really true in all cases? In fact, there are always people who claim to have seen animals that shouldn't even exist anymore! In today's video we will find out what these unique reports are all about and which fascinating creatures unfortunately no longer belong to the natural face of the planet!