Sabah Mountain Pit-viper

The Sabah pit viper, or Sabah bamboo pitviper, is a venomous pitviper, now often placed in the genus Popeia. If defined narrowly it is endemic to Borneo; if defined more broadly it consists of five subspecies found in Southeast Asia, including forms on Sumatra, the Mentawai Archipelago, Tioman Island and the Malay Peninsula. Adults may attain a snout-vent length of 62 cm, and it is uniform green above and pale green below (Wikipedia, general species account).