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
(..) There are only forty Amur leopards left in the wild and that number is falling. Like so many creatures, the cats have been pushed to the very edge of extinction by hunting and the destruction of their habitat. The Amur leopard symbolises the fragility of our natural heritage. hangs on survival (..)2006 TvShow: Planet Earth Title: From Pole to Pole Season: 1 Episode 1