Several bird species are threatened with 'extinction'. = Several bird species are 'on the brink of extinction'.
Mass 'extinctions' of prehistoric animals are known to have occurred.
the 'extinction' of all life in the region
(..) Well, excuse me! How can this shark still be alive after all this time? Some scientists believe the Megalodon survived the extinction of the dinosaurs and the ice age by living in deep-water trenches. And no one's seen one after all this time? (..)2002 Shark Attack 3: Megalodon