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Apparently, the mass extinction caused by humans is already beginning to take on the contours of the mass extinctions of the past. *Note: the thumbnail image is a pile of thousands of bison skulls hunted in the US so that their bones could be used as fertilizer. It dates back to 1870 or so. My Twitter: /pirulla25 My fanpage: /canaldopirula My Instagram: @pirulla25 Link to the article that came out this month and that I cite in the video: http://www.pnas.org/content/early/201... IUCN website: http://www.iucnredlist.org/ Series of videos about the rarest species in the world on Blablalogia: • The 5 rarest mammals in the world! -... • THE 6 RAREST BIRDS IN THE WORLD - Curio... About the sixth mass extinction: https://www.newscientist.com/article/... About the current lion population: http://www.iucnredlist.org/details/15... Opening music: Composition: Pirulla Recording, production and mixing: Bruno Cesar Bastos Contact: www.brucebastos.com