Hump-nosed pit viper (Family - Hypnale Hypnale) - This snake species belongs to the venomous line of Pit Vipers, and is endemic to India and Sri-Lanka. They don't bear the strongest venom, but if their bite is untreated within a few hours, it can be potentially fatal to humans. Looking like dead tree barks / branches or even leaves sometimes, they are hard to spot, which increases the risk of getting bitten by them in the wild.
They are endemic to India and Sri-Lanka, and they live in wet and humid conditions. I clicked this image during my trek to Gerusoppa, Shimoga (Western Ghats) here in South India, where the lush green jungles are a bliss to eyes! Danger lurks in every footstep in such dense forests, and one must be extremely careful about every step they take. To make the matters worse, such places are usually Leech infested!
''Hypnale hypnale'' is a venomous pitviper species endemic to India and Sri Lanka. No subspecies are currently recognized.