One day in early 1833, a native chief approached two Western missionaries working on the Indonesian island of Sumatra to relate a bizarre experience. The chief, Tam Basar by name, swore that he and a companion had seen a snake flying through the air. Fearing that it was dangerous, they killed it when it landed near them. When the missionaries expressed incredulity, the chief insisted that he was telling the truth. He added that the snake, 4ft (1.2m) long, had no wings, which to the listeners only made the story more far-fetched.
A year later, in January 1834, one of those missionaries, NM Ward, happened to be walking through a forest near the Pedang-Bessie River, a mile or so (1.6km) from the location where the flying snake had allegedly appeared. He and a companion stopped to study a particularly tall tree. Looking up, they were stunned to see a flying snake, exactly as described by the native informant. Four feet long and wingless, it was moving rapidly through the air from the tree they were standing under to another about 240ft (73m) away.
“Thus,” Ward wrote in the Missionary Herald of March 1841, “was I convinced of the existence of flying serpents; and, on inquiry, I found some of the natives, accustomed to the forest, aware of the fact.”
http://www.forteantimes.com/features/articles/1975/sky_serpents.html
