The four venomous snake species responsible for causing the greatest number of medically significant human snake bite cases on the Indian subcontinent are sometimes collectively referred to as the Big Four. They cause 46,000–60,000 deaths each year. The snakes are:
Russell's viper, Daboia russelii
Common krait, Bungarus caeruleus
Indian cobra, Naja naja
Indian saw-scaled viper, Echis carinatus From Wikipedia
