Imagine a world without giraffes
Updated 11:29 AM ET, Mon December 12, 2016
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John D. Sutter is a columnist for CNN Opinion who focuses on climate change and social justice. Follow him on Snapchat, Facebook and email. This story is part of CNN's "Vanishing" series. Learn more about the sixth extinction and get involved.
(CNN)It's the tallest land-based mammal in the world.