Generally, Poisonous snakes have a more triangular-shaped head, whereas nonpoisonous snakes typically have flatter heads. Additionally, the pupils of a poisonous snake’s eyes will generally be elliptical (like an arrowhead), while those of nonpoisonous snakes are more round. When trying to identify a snake you suspect may be venomous, always proceed with caution and err on the side of safety. Never attempt to handle or capture a snake yourself if you are not absolutely certain that it is nonpoisonous.