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Estimated world population of Sumatran Orangutan (7,300 individuals) is 20 x Number of passengers on a Boeing 777-300 airliner (typical configuration) (368 )
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Forest in Philippines (2011) (77,700 km^2)
Yes, there's now a book based on these numbers. Oxford University Press: July 2018.
Click here to learn more about it.
Click here for Podcast: Andrew Elliott interviewed for New Books Network.