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How to Determine Venomous From Nonvenomous Snakes

It's important to know how to identify a poisonous snake, even if you live in a area that is not normally inhabited by them. You don't always need to see a snake to identify it. A snake can also be identified by its bite markings, choice of prey or habitat. Knowing how to identify a poisonous snake may save a life.

Instructions

- 1
  Know about snakes that are indigenous to your area. Learn what characteristics your local venomous snakes have (See References 1 and 2).
- 2
  
  Poisonous snakes have eyes like a cat.
  
  Take note of the snake's eyes. The eyes of non-venomous snakes have round pupils. Venomous snakes typically have an elliptical pupil, like cat's eyes (See Reference 1).
- 3
  
  A Western Diamondback snake in the desert.
  
  If possible, look carefully at the colors or markings of the snake. Stripes running from head to tail indicate a nonpoisonous snake. Diamond-shapes usually indicate a poisonous snake especially if they are in three colors (See References 1 and 2).
- 4
  
  A rattlesnake poised to strike.
  
  Listen for any warnings the snake might give off, like a hiss or a rattle. A snake that makes a noise when you approach or displays any aggression is more likely a venomous snake (See References 1 and 2).
- 5
  Use bite marks left by the snake to determine if it is venomous or not. A venomous snake will leave two distinct puncture wounds. The affected area will also swell and discolor very quickly (See Reference 3).
- 6
  Be aware of your immediate surroundings and watch how the snake uses them. A snake that moves through a wet area and stays on the top of the water is almost certainly a venomous snake (See Reference 1).

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