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
(..) - Oh. I implied. - A gamble? An act of faith. One I hope you will repeat in the future in Starfleet. In the face of extinction it is only logical I resign my Starfleet commission and help rebuild our race. And yet you can be in two places at once. I urge you to remain in Starfleet. (..)2009 Star Trek