If you were a crested serpent eagle riding the high air thermals, gliding a mile above the Rantau Prabat district of North Sumatra province on the island of Sumatra, the area that is locally known as the Hadabuan Hills would look something like a giant green octopus swimming through an ocean of palm oil plantations. The neatly ordered palm trees might also appear something like a strange jungle-themed quilt, but in the middle of it all rises a cluster of twisted mountain ridges that are too steep for plantations, and as a result, are still covered in the evergreen rain forest that once carpeted the entire island.

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