From a cosmic gamma ray burst bombarding the atmosphere, triggering the very first mass extinction, to an asteroid the size of Mount Everest slamming into the Yucatan, killing off the dinosaurs, these terrible natural events caused unparalleled devastation. Throughout the 600-million-year history of animal existence, some 99.9 percent of all animal life that has ever lived is now extinct.

From a cosmic gamma ray burst bombarding the atmosphere, triggering the very first mass extinction, to an asteroid the size of Mount Everest slamming into the Yucatan, killing off the dinosaurs, these terrible natural events caused unparalleled devastation. Throughout the 600-million-year history of animal existence, some 99.9 percent of all animal life that has ever lived is now extinct.

From a cosmic gamma ray burst bombarding the atmosphere, triggering the very first mass extinction, to an asteroid the size of Mount Everest slamming into the Yucatan, killing off the dinosaurs, these terrible natural events caused unparalleled devastation. Throughout the 600-million-year history of animal existence, some 99.9 percent of all animal life that has ever lived is now extinct.