Indochinese Rat Snake

The Indo-Chinese or Chinese rat snake is a colubrid endemic to Southeast Asia. The snout is obtuse and projecting and the eye very large. It is brown or olive above, with the scales on the rear body and tail often yellow and edged with black, and the underside is yellow. Young snakes have transverse series of round whitish spots or narrow yellow bars (Wikipedia, general species account).

It is diurnal and both tree-living and ground-living, eating rodents, birds, lizards and frogs, and is found up to 3,000m. Females lay four to twelve eggs in June and July. The account opened describes it as endemic to Southeast Asia, and the Reptile Database summary lists Myanmar, so its presence in Bhutan is flagged for checking.