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Anther occurred when the Cretaceous period became the Tertiary about 65 million years ago, when 75 percent of species disappeared. This article is about the first mass extinction at the end of the Ordovician geological period 440 million years ago, when about 86 percent of species were killed.
Earth has entered sixth mass extinction, warn scientists. Humans are responsible for so many species dying out that we are now in a sixth mass extinction, Stanford University has warned. Earth has entered its sixth mass extinction with animals now dying out at 100 times the normal rate, scientists have warned. Humans have created a toxic mix of habitat loss, pollution and climate change, which has already led to the loss of at least 77 species of mammals, 140 types of bird since and 34 amphibians since 1500.