http://www.articleheaven.net en-us editorial@articlealley.com Since the emergence of life on Earth, there have been 500 million kinds of living on the earth, but now the vast majority has disappeared. The extinction of species is a natural phenomenon in the evolutionary history of life on Earth, it should be a norma... http://www.articleheaven.net/the-extinction-of-wild-animals-1306430.html 21st December 2009