The Large-eyed Pit Viper (Trimeresurus macrops) is a fairly widespread species in Thailand, and can be fairly common in the right habitat.
More details will follow once I have more time on my hands (which could take a while), but here follow some images to keep you entertained.
Large-eyed Pit Viper (Trimeresurus macrops) female in situ next to pink eggs from a water snail in Pak Chong, Nakhon Ratchasima, Thailand
Large-eyed Pit viper (Trimeresurus macrops) male in Pak Chong, Nakhon Ratchasima, Thailand
Large-eyed Pit Viper (Trimeresurus macrops) juvenile (in situ) in Sung Noen, Nakhon Ratchasima, Thailand
Large-eyed Pit viper (Trimeresurus macrops) female in Pak Chong, Nakhon Ratchasima, Thailand
Large-eyed Pit Viper (Trimeresurus macrops) adult male in Sung Noen, Nakhon Ratchasima, Thailand
Large-eyed Pit Viper (Trimeresurus macrops) in Nakhon Ratchasima, Thailand