This population of 800 orangutans turned out to be their own species, the Tapanuli orangutan.
That means that there are 800 fewer Sumatran orangutans than previously thought, and that the new species is the rarest known great ape on earth.
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also, here’s the Current Biology article, in case peeps are skeptical about the differences
http://www.cell.com/current-biology/fulltext/S0960-9822(17)31245-9