If the head of the snake has small scales covering the whole surface of the head it indicates
Viper
Cobra
Krait
Non venomous
All poisonous snakes have small head scales except cobra, krait & pit viper. These three snakes can be identified by 1. Pit viper: pit below the eye 2. Cobra: 3rd labial touches eye and nasal shields 3. Krait: 4 infralabial scales below mouth & 4th being largest Russel viper
Toxicology - 2