A fairly recent study[1] concluded that only less than 15% of all species still existing on planet Earth have been fully described, cataloged, and understood at the present time. That amounts to around 1.2 million known species, but it is estimated anything up to 7.5 million other species are still waiting to be discovered. Viewed in this context, the notion that people know everything about the planet and the species on it is clearly a fallacy. The truth is that unknown species vastly outnumber those that are known.
