As with all pit vipers, the Big-eyed Pit Viper has heat-sensing organs, i.e. pits on the side of its head, located between its eye and nostril.

VENOMOUS! This snake is semi-dangerous. It has a hemotoxic venom and though envenoming is rarely deadly and unlikely, if left untreated lethal potential cannot be exclude. Its bite may lead to local pain, swelling, blistering, bleeding, necrosis and coagulopathy. Thailand Antivenom Code: SAsTRC01