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Green pit viper is a venomous pit viper species endemic to Sri Lanka. It is a sexually dimorphic and mid-sized species. The neck is distinct from the flattened, triangular head. There is a loreal pit on each side of the head. Mid-sized eyes and a short, rounded, broad snout are present. The males are smaller than females. The venom is primarily haemotoxic, with victims experiencing severe pain and swelling of the bitten area, oedema and blisters, and localised tissue necrosis; the pain of the wound may last for a few days.( More information-https://en.wikipedia.org/wiki/Trimeresurus_trigonocephalus)
It is arboreal and nocturnal, occasionally descending to the ground in search of food such as lizards, frogs, small mammals, and birds. This sluggish pit viper is usually encountered on low shrubs during morning hours, but it mostly occupies in grasslands and rain forests. In mornings, it is seen to stay on top of trees to obtain sun rays to heat its body. It uses its tail to hold on to a tree branch.