Zayuan Mountain Pitviper

The Zayuan mountain pitviper (Ovophis zayuensis) is a venomous mountain pit viper endemic to China and India, recorded in Xizang and Arunachal Pradesh at elevations of about 1,280–2,100 m. It was originally treated as a subspecies of Ovophis monticola and elevated to species level in 1995. (The Reptile Database; Wikipedia, general species account)

It is a stout snake with a triangular head and a plain pale yellow belly. The black blotches on the body grow progressively darker towards the tail. It is oviparous. (Wikipedia, general species account)