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During the past 500 million years, there were five "mass extinctions". This was a  study by Gerardo Paul Ehrlich and Rodolfo.  The big five mass extinctions Late Devonian, 375 million years before - 75% of species lost. End Permian, 251 million years before - 96% of species lost. End Triassic, 200 million years before - 80% of species lost. End Cretaceous, 66 million years before - 76% of all species lost.  Scientists say we've entered a sixth mass extinction.  According to a  new study , humans are the primary cause. Earth is on the verge of sixth mass extinction.  Scientists warn that the "6th mass extinction" of wildlife is more severe than perceived. Scientists had analyzed both common and rare species of animals world. The Earth’s sixth mass extinction is more severe than thought. It would appear by just counting lost or surviving species. The population of all species is in decline. Their only natural habitat is decreasing worse. ...