The Big Five Mass Extinctions in The History of Our Planet

Extinction is a natural process that happens to all species. It is driven by natural selection.

An interpretation of a day from the time of the dinosaurs

So far it is known that over the years there were five big mass extinctions throughout the existence of our planet. The oldest one was the Ordovician Extinction, 450–440 million years ago, and the latest one was the KT Extinction, 66 million years ago.