The population of orangutans in Indonesia has plummeted. But these tree-dwelling great apes can be difficult to find and count. Enter Conservation Drones, a group that flies camera-equipped drones to gather data about orangutans' whereabouts and numbers. Learn more about Conservation Drones, and other surprising uses for drones: news.nationalgeographic.com/news/2013/12/131202-drone-uav-uas-amazon-octocopter-bezos-science-aircraft-unmanned-robot/ Onward is a project to explore the world and share its untold stories. Hit the road with National Geographic multimedia journalists Spencer Millsap and Dan Stone at onward.nationalgeographic.com, or tweet them at @spono and @danenroute to join the conversation.

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