4. Viperidae Family of Snakes
From the gaboon vipers to the horned vipers amongst others, this family of venomous snakes is found in all parts of the world except Hawaii, Ireland, Antarctica, Madagascar and interestingly, Australia.
Apart from being nocturnal, this family of snakes has short temperament traits and is very fast. They possess venom that has a common symptom after a bite which includes bleeding gums and a drop in blood pressure and heart rate.