If history is any indicator, there have been events that wiped out most or all of a species. Even in our times, nature has swayed at her discretion; look at the

If history is any indicator, there have been events that wiped out most or all of a species. Even in our times, nature has swayed at her discretion; look at the earthquakes and tsunamis and the destruction to human life and property. Such events are likely to re-occur.