TOP 3 MOST COMMON TRAITS OF VENOMOUS SNAKES: 1) It is big and fat (all in the USA, except that red-black-yellow coral, are fat pit vipers) 2) It is a rattlesnake, with real rattles on the end of its tail 3) It has elliptical pupils (but I doubt you're close enough to look) #Diagnosis #Toxicology #Snakes #Venomous #Nonvenomous #Identification #Shape #Characteristics