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Earth teems with a staggering variety of animals, including 9,000 kinds of birds, 28,000 types of fish, and more than 350,000 species of beetles alone. What explains this explosion of living creatures-1.4 million different species discovered so far, with perhaps... Science http://topdocumentaryfilms.com/what-darwin-never-knew/ http://topdocumentaryfilms.com/what-darwin-never-knew/ 170517