Alan, a male Sumatran orangutan at Zoo Atlanta, USA, turned 43 on May 3, making him the oldest male member of his species in North America. Known for his impressive size, long hair and fondness for shiny objects, Alan is also famous for his frequent long call, a deep booming vocalization used by adult male orangutans to warn other males or to impress females. For more, visit http://ift.tt/RgKz6m. http://ift.tt/RgKzmA
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