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Tropidolaemus subannulatus complex
I believe this is a green pit viper. Spotted in a nature reserve north of Kota Kinabalu, Borneo
This looks exactly like many images from Borneo labeled Trimeresurus wagleri/Tropidolaemus wagleri. The T. wagleri complex was revised in 2007 and Bornean and Sulawesian forms were put into Tropidolaemus subannulatus, a complex itself to be further revised.